The Correct Answer is A.
The Ping of Death is a type of cyber attack that involves sending a maliciously crafted ping (ICMP Echo Request) packet to a target system. The cause of the Ping of Death issue is typically related to Buffer overflow.
Buffer overflow occurs when more data is written to a block of memory, or buffer, than it was allocated to hold. In the context of the Ping of Death, the attacker sends an oversized ICMP packet, exploiting a vulnerability in the way the target system handles or processes ICMP packets. This can lead to the overflow of buffers, potentially causing the system to crash or behave unexpectedly.