AnMX (Mail Exchange)record defineswhich mail servers are responsible for receiving emailfor a domain. If you want to change or redirect email traffic, theMX recordmust be updated with the correct server information.
Option B (TXT):Stores text-based info - used for SPF, DKIM, etc.
Option C (SPF):Part of email authentication stored in a TXT record; doesn't redirect traffic.
Option D (CNAME):Alias for another domain name - not used for email routing.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 2.4: Compare and contrast common networking hardware.