Which statement is true about the effect of the command?

You execute the following command in the user session:
SQL> ALTER SESSION SET PLSQL_DEBUG=true;
Which statement is true about the effect of the command?

A.
All PL/SQL blocks that are executed subsequently in the session are traced.

B.
It enables all PL/SQL blocks that are compiled subsequently in the session for tracing.

C.
Only anonymous PL/SQL blocks that are executed subsequently in the session are traced.

D.
It enables only named PL/SQL blocks that are executed subsequently in the session for
tracing.