Which of the following antibiotics is the EXCEPTION among typically bactericidal agents — i.e., it is generally bacteriostatic rather than bactericidal?

Beta-lactams (cephalexin, amoxicillin, penicillin) are classically bactericidal, killing bacteria by inhibiting cell wall synthesis. Doxycycline, a tetracycline-class antibiotic, is classically bacteriostatic — it inhibits bacterial protein synthesis (30S ribosomal subunit) and halts bacterial growth/reproduction rather than directly killing the organism, relying on the host immune system to clear the (now non-replicating) bacteria.