A cybersecurity analyst is investigating a series of suspicious network activities that have been flagged by the intrusion detection system. The analyst notices a pattern of packets that have unusually large sizes, which could indicate an attempt to exploit vulnerabilities through fragmentation attacks.

To further analyze these packets and identify potential threats, the analyst decides to examine the IPv$4$ datagram headers of the captured packets.

Which field in the IPV$4$ datagram header should the analyst focus on to determine the size of these packets and assess the risk of fragmentation attacks?

Total Length field

Fragment offset field

Time to Live $($TTL$)$ field

Identification field