NEET Exam Model Paper 1

Read the following statements
a) Mg2+,Ca2+ ions are necessary for muscular contraction.
b) F actin is a polymer of monomeric G actins
c) Ca2+ binds to the TpC and displaces troponin complexes, making myosin bindingsite free.
d) The globular head of myosin is an active ATPase enzyme
How many of the above statements are wrong