سوال ۲۲ کنکور ارشد علوم کامپیوتر ۱۳۹۸

Read the following excerpt from PASSAGE 2 and answer the question.

There is a similar comparison of electronic mail with voice telephone service. Voice service, in conjunction with an answering machine or voice mail service, in principle has most of the flexibility of electronic mail except for the ability to print a permanent record of a message. Voice, of course, has the additional advantage of immediate two-way interaction and of nonlinguistic communication via inflection and tone. Voice communication is more expensive, but requires only a telephone rather than a telephone plus computer.

Electronic mail _______ voice telephone service.