What is the primary benefit of using an external login system, such as Single Sign-On (SSO) or social media login, for accessing various applications?
A) It allows users to store more personal data on their accounts.
B) It provides a unified user experience by allowing users to access multiple services with a single set of credentials.
C) It improves the security of individual applications by requiring multiple passwords.
D) It eliminates the need for regular software updates.