What is the definition of selective toxicity in relation to anti-infectives?

The ability of an anti-infective completely eliminate all microorganisms from the host's body.

The ability of an article to the host while targeting microorganisms.

The ability of an anti-infective to kill or inhibit the growth of microorganisms without causing harm to the host

The ability of an anti-infective to target specific microorganisms without affecting other microorganisms