Which of the following is a type of access control that allows users to access multiple applications with one password?

Single Sign-On (SSO) is a type of access control that allows users to access multiple applications with one password. This system streamlines the authentication process by enabling users to log in just once and gain access to various systems without needing to input their credentials repeatedly. SSO enhances user convenience and reduces password fatigue, which can lead to better security practices as users may be less inclined to use weak or repetitive passwords.

By implementing SSO, organizations can improve the user experience while still maintaining security protocols. It centralizes user authentication and can simplify managing user access across multiple applications, making it especially useful in environments where users need to interact with numerous software platforms.

Other access control types, like discretionary access control and role-based access control, typically focus on how resources are allocated based on user roles or ownership, rather than providing a unified access point through a single authentication credential. User-based access control is similar to these, as it usually involves managing permissions based on individual user accounts rather than offering a broader, unified access solution like SSO does. Thus, Single Sign-On stands out as the most appropriate answer for this question.