DMARC builds on what other 2 industry standards to authenticate email?

DMARC builds on what other 2 industry standards to authenticate email?

• DKIM and SPF
• DKIM and SMTP
• SPF and SMTP
• DKIM and IMAP 

EXPLANATION

DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication, policy, and reporting protocol.
It builds on the widely deployed SPF and DKIM protocols, adding linkage to the author (“From:”) domain name, published policies for recipient handling of authentication failures, and reporting from receivers to senders, to improve and monitor protection of the domain from fraudulent email.

SOURCE

https://dmarc.org/