LHS = left hand side

RHS = Right hand side

A. LHS = 0+0 = 0

RHS = 0

∴ LHS = RHS

B. LHS = 0-0 = 0

RHS = 0

∴ LHS = RHS

C. LHS = 0× 0 = 0

RHS = 0

∴ LHS = RHS

D. LHS = 0÷ 0 is not defined, since denominator is 0

∴ it is not defined.