Cephalosporins
1. may be cross-allergenic with penicillin.
2. have a narrower spectrum than penicillin.
3. have a mechanism of action similar to that of penicillin.
4. may cause cholestatic hepatitis.

(1) and (3)

(1) (2) (3)

(2) and (4)

(4) only

All of the above.