If the mechanical advantage of a simple machine is 4, then the

Question

$\begin{array}{1 1} (a)\; \text{output force is 4 times the effort} \\ (b)\; \text{effort is 4 times the output force} \\ (c)\; \text{efficiency is 4 %} \\ (d)\; \text{the work output is 4 times the input} \end{array}$