Which of the following types of attacks is only intended to make a computer resource unavailable to its users?

A Denial of Service attack works by overwhelming a target system, network, or service with traffic or malformed requests so that legitimate users cannot access it. The sole intent of a DoS attack is availability disruption, not data theft or unauthorized access, which makes it the defining example of an attack targeting availability in the CIA triad.

A replay attack involves capturing and retransmitting valid data transmissions to gain unauthorized access, targeting authentication rather than availability.

A teardrop attack is a specific type of DoS that sends fragmented packets to crash a system, making it a subset of DoS rather than the general category that answers the question.

A land attack is another specific DoS variant that sends a packet with identical source and destination IPs, again a subset and not the correct general answer.