Is there any difference between wait$($NULL$)$

and waitpid$(-1,$ NULL, $0)?$

A$.$ No difference: Both wait$($NULL$)$ and waitpid$(-1,$ NULL, $0)$ behave

the same way, waiting for any child process to terminate.

B$.$ Yes, there's a difference: wait$($NULL$)$ only waits for a specific

child process to terminate, while waitpid$(-1,$ NULL, $0)$ waits for

any child process.

C$.$ Yes, there's a difference: wait$($NULL$)$ waits for any child process,

but waitpid$(-1,$ NULL, $0)$ waits only for a specific child process

with a given PID.

D$.$ Yes, there's a difference: wait$($NULL$)$ waits for any child process,

while waitpid$(-1,$ NULL, $0$