Treatment course of bacterial pneumonia included benzylpenicillin sodium salt. What is the mechanism of its antimicrobial action?

Answer options

1. Inhibition of the SH enzyme groups of the microorganisms
2. Inhibition of the intracellular protein synthesis
3. Inhibition of the cholinesterase activity
4. Inhibition of cell wall synthesis of the microorganism
5. Antagonism with the paraaminobenzoic acid