If there are m unknown member forces, r unknown reaction components and j number of
joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by
(A) m + r + 2j
(B) m - r + 2j
(C) m + r - 2j
(D) m + r - 3j
joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by
(A) m + r + 2j
(B) m - r + 2j
(C) m + r - 2j
(D) m + r - 3j