Cefaclor is.. 2nd generation cephalosporin

Cefaclor is:
a- 1st generation cephalosporin.
b- 2nd generation cephalosporin.
c- 3rd generation cephalosporin.
d- non of the above.
1st gen:
cefadroxil (Duricef), cefazolin (Totacef), cephalexin(Ceporex), cephalothin, cephradine (Velocef), cephapirin (Cefatrexyl).
2nd gen:
cefaclor, cefoxitin, cefotitan, cefuroxime (Zinnat), cefprozil (Cefzil), loracarbef.
3rd gen:
cefotaxime (Claforan), cefoperazone (Cefobid), cefotriaxone (Rocephin) ,cifixime (Suprax), ceftizoxime (Cefizox), proxetil, cefdinir, cefditoren, pivoxil, ceftazidime (Fortum), ceftibuten, ceftizoxime.
4th gen:
cefepime (Maxipime), cefpirome (Cefrom), cefpodoxime.