What are 3 ways multi-factor authentication could increase the strength of your systems security (computer, phone, etc.)?

Description

In Chapter 2 ( https://ihatefeds.com/No.Starch‑2020‑Foundations.of.Information.Security.pdf) we’ve looked at various ways of identifying and authorizing on our systems. As before, please discuss the following in a (SINGLE .PDF DOCUMENT):

1. What are 3 ways multi-factor authentication could increase the strength of your systems security (computer, phone, etc.)? Include 3 types of multi-factor authentication and how these would help or not. 2. Devil’s advocate: Please discuss 2 reasons why a multi-factor authentication solution may not be successfully adopted in an organization?