In Microsoft 365, the valid multi-factor authentication (MFA) methods include:
A. Receiving an automated call on the desk phone that includes a verification code.
C. Receiving a call on a mobile phone and selecting the pound sign (#) when prompted.
D. Receiving an SMS text message that includes a verification code.
However, option B, "Insert a small card into a desktop computer and provide a PIN code when prompted," is not a valid MFA method in Microsoft 365. This method describes a smart card authentication, which is not part of the standard MFA options provided by Microsoft 365.