What means can a worm use to access remote systems to propagate?

The correct A remote file access or transfer service to another system to copy itself from one system to the other.

A worm is a program that actively seeks out more machines to infect, then each infected machine serves as an automated launching pad for attack on other machines.

A worm can replicate itself through electronic mail or instant messaging, file sharing, remote execution capability, remote file access or transfer capability, remote login capability.

A worm executes a copy of itself on another system, either by using an explicit remote execution facility or by exploiting a program flaw in a network service to subvert its operations.

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