When Karen, a senior employee, downloads documents from her firm's website, she deals with a series of checks for access. She has to use a username and password to enter the website. She is required to confirm her identity on her smartphone followed by an image verification on her computer. This is an example of the use of $\_\_\_\_\_\_\_\_.$

Group of answer choices

biometrics

assistive technology

an applicant$-$tracking system

a decision support system