Which type of tables may be extended by other tables, but do not extend another table?

[MadhumalaP]

Which type of tables may be extended by other tables, but do not extend another table?

A. Base Tables
B. Core Tables
C. Extended Tables
D. Custom Tables

[Kieran Anson · Accepted solution]

A base table is potentially extendable but isn't itself extended. You can think of base as the bottom, the root. There's nothing below it. 

Examples are task, cmdb, sys_user

These three are all examples of base and core tables 

[Kieran Anson · Accepted solution]

A base table is potentially extendable but isn't itself extended. You can think of base as the bottom, the root. There's nothing below it. 

Examples are task, cmdb, sys_user

These three are all examples of base and core tables 

[Dr Atul G- LNG · Accepted solution]

Hi @MadhumalaP 

The answer is Base table. It looks like you're preparing for the CSA exam. I highly recommend going through the eBook at least 3-4 times, as this question is directly from there.