The security administrator needs to create an account bob for a temporary employee. The employee will only perform simple document editing, so must not be allowed to modify the login environment. What is the correct way to add this user account?

A.
useradd -m -s /usr/bin/sh -d /export/home/guests/bob bob

B.
useradd -m -s /usr/bin/ksh -d /export/home/guests/bob bob

C.
useradd -m -s /usr/bin/rksh -d /export/home/guests/bob bob

D.
useradd -m -s /usr/bin/pfksh -d /export/home/guests/bob bob