Given XXX is a random variable, what is Var(cX)Var(cX)Var(cX) where ccc is a constant?
c2Var(X)c^2 Var(X)c2Var(X)
cVar(X)c Var(X)cVar(X)
Var(X)Var(X)Var(X)
c2E[X]c^2 E[X]c2E[X]