What's the difference between an IDS and an IPS?

Following are the differences between IDS and IPS

Explanation:

Intrusion Detection System ( IDS )

The system analyzes the network traffic for signals that shows that the attackers use to hack and steal the data is known as Intrusion Detection System ( IDS ). It detects different kinds of behaviors, like security violations and malware.

Intrusion Prevention Systems (IPS)

IPS works like a firewall between the external world and the internal network. IPS actively protects the network from threats based on the security profile provided.

i think the answer is a or d