A company wants its employee to use an email client that downloads and removes messages...

 POP3 (Post Office Protocol version 3) is a protocol that allows an email client to download and remove messages from an email server. POP3 would be the best protocol to configure in an email client to facilitate this requirement. IMAP (Internet Message Access Protocol) is a protocol that allows an email client to access and synchronize messages from an email server without removing them. ICMP (Internet Control Message Protocol) is a protocol that allows network devices to send and receive error or control messages. SMTP (Simple Mail Transfer Protocol) is a protocol that allows an email client to send messages to an email server or another email client. References: CompTIA IT Fundamentals+ Study Guide: Exam FC0-U61, Second Edition, Chapter 6: Infrastructure Concepts, page 233.