What does $HMM$ stand for in the context of muscle structure?

Which characteristic is $NOT$ associated with white muscle fibers?

The contractile protein of skeletal muscle involving ATPase activity is

$A$ ...... muscle rotates the forearm to turn the palm downwards.

During muscular contraction,which of the following events occur?
$(a)$ $'H'$ zone disappears
$(b)$ $'A'$ band widens
$(c)$ $'I'$ band reduces in width
$(d)$ Myosin hydrolyzes $ATP$,releasing the $ADP$ and $\Pi$
$(e)$ $Z$-lines attached to actins are pulled inwards
Choose the correct answer from the options given below.

Which of the following statements is correct regarding muscle contraction?