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