21) Advantages of using IM rather than email include A) lower cost than phone calls and email. B) availability on a wide range of devices. C) its ability to mimic conversation more closely. D) all of the above. 22) "Spim" refers to A) unwanted email from unknown sources. B) email that contains computer viruses. C) the IM version of email spam. D) none of the above. 23) Many businesses now use keep project teams up to date, inform to employees about general business matters, and provide customer support. A) social networking software B) memos C) blogs D) all of the above