Which two statements are true about signal handling in Oracle Linux?

Which two statements are true about signal handling in Oracle Linux?

A.
The pkill command kills a process by name.

B.
A process killed with the default signal always terminates gracefully if it: does not block the kill
request.

C.
The kill command sends a sigkill (signal 9) by default to the process being killed.

D.
The kill command may send a termination signal to more than one process at a time.

E.
All signals may be blocked by a process.

Explanation:
D: The kill command is used to send a termination signal to the specified process or
group.
Incorrect:
Not A: The following example shows the xscreensaver process (2609) which is to be terminated.
$ pgrep xscreen
2609
$ kill 2609
Though we use pgrep to find the PID of this process here we could have also used a PID from the
output of top or ps.
Not C: The kill command is used to send a termination signal to the specified process or group.
The default termination signal is a SIGTERM (15) signal.
Not E: When there a stubborn process trapping the kill command and refusing to terminate, the -9
(SIGKILL) signal should be used to kill the process. The -9 signal cannot be trapped by a process
and ignored.