Does Pool & Cluster tables has the same structure in both Dictionary and Db

------------ Exists with the same structure both in dictionary as well as in database exactly with the same data and fields
a. Pool Table
b. Cluster Table
c. Transparent Table
d. All the above
To my knowledge, I know transparent table has the same structure in both Dictionary and database.
Can anyone tel me the answer for the above question.. whether it is
c. Transparent table
or
d. All the above

Transparent Table:
A physical table definition in the database for the table definition which is stored in the ABAP Dictionary for transparent tables when the
table is activated. The table definition is translated from the ABAP Dictionary to a definition of the particular database.
A transparent table in the dictionary has one to one relationship with a table in the database.
For each transparent table in the data dictionary there is one associated table in the database.The database table has the same name, the same number of fields and fields have same names as the transparent table definition. Transparent tables are used to hold application data. Application data is master data or transaction data used by an application.
e.g. master data - table of customers
Transaction data - order placed by the customers.
Pooled tables:
Pooled tables can be used to store control data (e.g. screen sequences,program parameters or temporary data). Several pooled tables can be
combined to form a table pool. The table pool corresponds to a physical table on the database in which all the records of the allocated pooledtables are stored.
Pooled table in R/3 has a many to one relationship with a table in the database. For one table in the database there are many tables in the R/3 data dictionary.R/3 uses pooled tables to hold large number of very small tables. You might create a table pool if yoou need to create hundreds of small tables that each hold only a few rows of data.
Cluster tables :
Cluster tables contain continuous text, for example, documentation.Several cluster tables can be combined to form a table cluster. Severallogical lines of different tables are combined to form a physical record in this table type. This permits object-by-object storage or
object-by-object access. In order to combine tables in clusters, atleast parts of the keys must agree. Several cluster tables are stored in
one corresponding table on the database.
A cluster table is similar to pool table . It has many to one relationship with the table in the database.
They are used to hold the data from a few(approximatelly 2 to 10) very large tables. They would be used when these tables have a part of their primary keys in common and if data in these tables are all accessed simultaneously.A cluster is advantageous in the case where data is accessed from multiple tables simultaneously and those tables have at least one of their primary key fields in common.Cluster table reduce number of database reads and thereby improves performance.

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