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 P rotocol) 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 messag es. 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 Concep ts, page 233.

Optical drive and HDD are the examples of storage devices that have a spinning disk among the given options. A spinning disk is a component of a storage device that rotates at high speed to store and access data on its surface. A spinning disk is usually made of metal, glass, or plastic and coated with a magnetic material. A spinning dis k has one or more read/write heads that move across the disk to read or write data on concentric tracks or sectors. An optical drive is a storage device that uses laser beams to read or write data on optical discs, such as CDs, DVDs, or Blu-ray discs. An H DD (hard disk drive) is a storage device that uses magnetic fields to read or write data on hard disks.  References  : The Official CompTIA IT Fundamentals (ITF+) Study Guide (FC0-U61), page 38-39.

The 5GHz frequency band is less pr one to interference from other household appliances, such as microwaves, cordless phones, and Bluetooth devices, than the 2.4GHz band. The 5GHz band also offers more non-overlapping channels and higher data rates than the 2.4GHz band. However, the 5GHz ban d has a shorter range and lower penetration than the 2.4GHz band, so the technician should consider the size and layout of the SOHO network before choosing the frequency band. 802.11b and 802.11g are wireless standards that operate in the 2.4GHz band, whil e 802.11a, 802.11n, and 802.11ac can operate in both the 2.4GHz and 5GHz bands.  References:

Basic Wired/Wireless SOHO Network | CompTIA A+ 220-1001 | 2 .3

Installing a SOHO Network – CompTIA A+ 220-1001 – 2.3

Installing and Configuring a SOHO Network - CompTIA A+ Complete: Review …