Which of the following is/are correct about passive fingerprinting in OS fingerprinting techniques?

It is used for transmitting the network packets to the remote hosts.

It is the process of analysing packets from a host on a network.

It allows the scanner to obtain more accurate results than a active scanner, and in a shorter amount of time.

These scanners are generally and inherently less accurate than active scanners due to the fact they have less control over the data they are analysing.

Both (2) and (4)