A.The process ID of the echo command.

B.The process ID for the following command.

C.The process ID of the current shell.

D.The process ID of the last command which has been placed in the background.

E.The process ID of the last command executed.

A.The script file must have the executable permission bit set.

B.The script file must be found in the $PATH.

C.The script must begin with a shebang-line (#!) that points to the correct interpreter.

D.The file system on which the script resides must be mounted with the option scripts.

E.The user issuing the command must be in the group script.

A.for

B.while

C.until

D.loop