Final answer:
Password complexity is the policy that determines the required mix of characters in a user's password, including uppercase, lowercase, numbers, and symbols.
Step-by-step explanation:
The password policy that defines the types of alphanumeric characters required to be utilized in a user's password is password complexity. Password complexity requirements ensure that a password includes a mix of uppercase and lowercase letters, numbers, and special symbols, thereby making it more difficult for unauthorized individuals to guess or crack. These requirements are crucial for maintaining the security of user accounts and protecting sensitive information.