Final answer:
Salesforce will prompt the user for additional authentication when logging in at a different location and machine.
Step-by-step explanation:
By default, when a user logs in for a second time at a different location on a different machine, Salesforce will b. prompt the user for additional authentication.
This additional authentication usually takes the form of a security challenge or multi-factor authentication, such as entering a verification code sent to the user's mobile phone or email.
This extra step helps enhance the security of the user's account by ensuring that only authorized users can access it even if their login credentials are compromised.