Which of the following should the IT security department implement to BEST resolve the issue?

A company has been migrating a significant number of its on-premises applications to various SaaS providers. The IT department has noticed the following:
1. User account management has become challenging.
2. User account compromises have increased.
3. Accessing various SaaS applications is challenging.
Which of the following should the IT security department implement to BEST resolve the issue? (Select THREE).
A. Single sign-on
B. Multifactor authentication
C. Network intrusion prevention system
D. Password synchronization
E. Federation
F. IPSec tunnel to the SaaS providers
G. VPN to SaaS providers