ser$1$ is attempting to assist user$2$ with terminating user$2\text{'}$s process $1234.$ user$1$ entered the following:

kill $-91234$

Why does the process continue to run?

You can kill a process only if you are root.

You can kill only a process that you own unless you are root.

You can kill the process only with the pkill command.

You need to kill the process with a stronger kill signal.