A Company's User Community Is Being Adversely Affected by Various

Multiple Choice

A company's user community is being adversely affected by various types of emails whose authenticity cannot be trusted. The Chief Information Security Officer (CISO) must address the problem. Which of the following solutions would BEST support trustworthy communication solutions?

A) Enabling spam filtering and DMARC.
B) Using MFA when logging into email clients and the domain.
C) Enforcing HTTPS everywhere so web traffic, including email, is secure.
D) Enabling SPF and DKIM on company servers.
E) Enforcing data classification labels before an email is sent to an outside party.