Final answer:
The most secure option for multifactor authentication is using a smart card and passphrase.
Step-by-step explanation:
If your company wants to use multifactor authentication, the most secure option would be to suggest the use of Smart card and passphrase. This method combines something the user has (the smart card) with something they know (the passphrase), providing an extra layer of security. This is superior to options like username and password or security questions, which can be easier for attackers to bypass.