Network scan and banner grab are the following tasks should be done FIRST.
A. Network scan
B. Banner grab
Explanation:
The penetration tester has been assigned a task to determine which ports are open on the given network.
To kick start the process, the tester should give a network scan in order to gather information about the various elements of the network and their details.
To follow up, the tester should proceed with banner grab. Banner grabbing is the process through which he/she would gain information about a computer system on the network and services running on its open ports.