Users throughout alison's organization have been receiving unwanted commercial messages over the organization's instant messaging program. what type of attack is taking place?

The choices are a) Spam b) Phishing c) Social engineering d) Spim. The answer is a. spam. Those are messages are usually unwanted messages that send their commercial emails to people. Spam has similarity with spim since they both are unwanted messages that at times may contain worms and viruses. However, spim appears in instant messages which become the spam on instant messages.