How is a worm different from a Trojan?

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

B$.$ A worm gathers inform transmits to a server, whe Trojan hides and then spi through a network.

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

D$.$ A worm prevents a dev functioning until a ransom whereas a Trojan gathers and transmits it to another