ACME Services$$leverages its$$groundbreaking$$intellectual property $($IP$)$ to maintain its leadership within a highly competitive$$service industry. $$If ACME Services'$$IP were to become public knowledge, its much larger competitors would be able to quickly adjust their business practices and ACME Services$$would no longer be able to$$effectively$$compete within the market space. $$Because their IP is so critical to the success of their business, ACME Services uses a two$-$factor authentication process before they grant access to their IP$.$Their two$-$factor authentication is built upon "something the user knows" and the chip in their employee badge. Which of the following best describes "something the user knows"?

Question $35$ options:

Fingerprint

CAC Card

Password

Iris Scan