Out of the following, which one will be altered or modified by a computer virus

A digital code attached to an electronic message to provide it unique identity.

Digital code attached to a message that uniquely identifies the message is called

A _____ is a program that ears up all the space by replicating itself.

Unlike a computer virus a ________ can replicate itself automatically.

________ and _________ are the two types of malware.

____ attack eats up all the resources of  a system and halts it.

Which of the following is not a recovery software?

Which of the following backup methods copies files or folders without any compression?

Type of back up in which only the data that changed since last backup is saved.