T point ifg-(z, +) and h-(2z, +), then [g:h]= a) 1 b) 2 c) 3 d) 4 oa o b oc od 1 point itf 1s homomorphism of a group g mto a group g with kemal k, then a. kis

T point IfG-(Z, +) and H-(2Z, +), then [G:H]= a) 1 b) 2 c) 3 d) 4 OA O B OC OD 1 point ItF 1s homomorphism of a group G mto a group G with kemal K, then A. Kis a subset of G' B. Kis a subgroup of G but not a normal subgroup of G C. Kis a normal subgroup of G. D. None of these. OA OB Oc O D