Multifactor authentication $($MFA$)$ is considered an important security control for what purpose?

Question $9$ Answer

a$.$

MFA establishes internal network controls

b$.$

MFA distinguishes a known device from an unknown device

c$.$

MFA identifies a cyberattack before it can cause damage

d$.$

MFA provides an extra level of identity assurance $($that is$,$ validates users are who they claim to be$)$