How is a worm different from a Trojan?

A$.$ A worm reproduces itself on the same computer, whereas a Trojan athempts to spread through the network.

C$.$ A worm spreads through a network, whereas a Trojan hides inside another program.

B$.$ A worm gathers information and fransmits to a server, whereas a and then spreads through a network.

D$.$ A worm prevents a device from functioning until a ransom is paic Trokan gathers information and fransmits it to another device.