Given the following script， why does the output come out as an empty line instead of "dog"（）#!/bin/ksh  $VAR=dog  echo "${VAR}"

• A、The $VAR variable was not exported.
• B、The $VAR should have been set as VAR.
• C、dog needs double quotes around it when setting $VAR.
• D、The { } should not be around VAR in the echo command.