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CompTIA Security+ · CompTIA
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A. PIN Here’s why: PIN (Personal Identification Number): When using a smart card, the smart card itself serves as one factor (something you have), and the PIN entered to access the smart card provides the second factor (something you know). This combination of something you have (the smart card) and something you know (the PIN) constitutes MFA. The other options are not directly related to the authentication factor provided by the smart card: -Hardware token: This could be another factor for MFA but is not used in conjunction with a smart card; instead, it’s a standalone factor. -User ID: This is usually a username and not a factor in MFA. -SMS: This can be used as an additional factor in some MFA setups but is not directly related to smart cards. It represents a different method of delivering a second factor, such as a one-time passcode sent via text message.
When using a smart card as part of MFA, the additional factor is typically a PIN. The smart card provides something you have and the PIN provides something you know, which together constitutes two factors of authentication.