How does an IPS differ from an IDS?

Question $81$ options:

An IPS is passive and an IDS is active.

An IPS uses heuristics and an IDS is signature$-$based.

An IPS will block, reject, or redirect unwanted traffic; an IDS will only send an alert.

An IDS will block, reject, or redirect unwanted traffic; an IPS will only send an alert.s tokens are defined as "something you know."