Which of these is always true for the variance of any random variable XXX?
Var(X)≥0Var(X) \ge 0Var(X)≥0
Var(X)=0Var(X) = 0Var(X)=0
Var(X)≤1Var(X) \le 1Var(X)≤1
Var(X)=E[X2]Var(X) = E[X^2]Var(X)=E[X2]