With CSS scripting, which script is correct?

A.
set $MyVar “100”
echo “Variable value is ${MyVar}”

B.
set MyVar “100”
echo “Variable value is ${MyVar}”

C.
MyVar = “100”
echo “Variable value is ${MyVar}”

D.
$MyVar = “100”
echo “Variable value is ${MyVar}”

E.
None of the above