CompTIA A+ explains that DMARC (Domain-based Message Authentication, Reporting, and Conformance) relies on TXT DNS records to define its policies. TXT records allow administrators to publish arbitrary text- based configuration data, including DKIM and SPF policies, which DMARC references.
MX records identify mail servers, A records map IP addresses, and CNAME records create aliases none are used to store DMARC policy rules.
DMARC improves email authenticity by requiring SPF and DKIM alignment and specifying how receiving servers should handle failed validations. The A+ exam explicitly mentions TXT records as the method used for SPF, DKIM, and DMARC storage.
Therefore, the correct answer is the TXT record, which stores the policy used by DMARC to authenticate senders and prevent spoofing.

Choppy or unintelligible audio is typically caused by issues with the microphone, such as poor quality, hardware defects, or misconfiguration.
Why Not A (Webcam): The webcam handles video, not audio.
Why Not B (Digitizer): A digitizer relates to touchscreens, not audio.
Why Not C (Inverter): Inverters manage power for displays, not audio.
CompTIA A+ Exam Reference: Core 1 (220-1201), Section 3.6, audio troubleshooting.

Cellular networks offer broad coverage in rural or less populated areas where laying fiber, cable, or DSL lines may not be feasible or cost-effective. Cellular broadband (4G LTE/5G) provides fast speeds using existing mobile network infrastructure.
From CompTIA A+ 220-1101 Official Study Guide, Objective 2.7 - Compare and contrast Internet connection types:
"Cellular connections offer high speed and extensive coverage, especially in areas where other wired infrastructure may not exist or be practical." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Internet Connections CompTIA Exam Objectives 220-1101, Domain 2.7

Mesh networks rely on multiple access points (or mesh nodes) to create a seamless, self-healing network.
Each access point communicates with others to extend coverage and improve reliability without requiring a wired backbone for each AP.
Reference:CompTIA A+ Certification Exam Core 1 Objectives - Domain 2.0 Networking - Objective 2.4:
Compare and contrast wireless networking protocols.

Comprehensive and Detailed Explanation From Exact Extract (Aligned With CompTIA A+ 220-1201 Study Guide) CompTIA A+ Core 1 memory standards describe the differences between DDR generations. One of the key improvements in DDR4 over DDR3 is reduced operating voltage, which allows lower power consumption and increased efficiency.
* DDR3 operates at 1.5V (some variants 1.35V)
* DDR4 operates at 1.2V (some variants 1.05V LPDDR4)
This lower voltage is a recognized defining characteristic separating DDR4 from DDR3.
Other differences such as increased speed and internal bank structure exist, but the question specifically asks for the characteristic that differentiates DDR4 from DDR3 - and voltage is the correct, primary distinction used in CompTIA A+ materials.
Why the other options are incorrect
B). Higher latency
DDR4 generally has slightly higher CAS latency numbers, but due to increased speed, real latency is similar.
This is not the standard differentiator referenced by CompTIA.
C). Increased DIMM width
DDR3 and DDR4 standard DIMMs both have a 64-bit data width.
D). Single-sided modules
Both DDR3 and DDR4 can be single- or double-sided; not a differentiating factor.