In which of the following is customer access blocked and alert disabled?

The scenario described relates to maintenance mode, wherein customer access is specifically blocked, and alerts are disabled. During maintenance, systems or applications are taken offline to perform necessary updates, fixes, or improvements without user interruptions. This ensures that clients do not attempt to access services that are undergoing changes or are not fully functional, preventing potential errors or data issues. Disabling alerts during this process also helps to avoid user confusion, as notifications about service issues or maintenance would be irrelevant at this time.

In contrast, a hosted VM typically allows for customer access unless specifically configured otherwise, while public and hybrid clouds generally aim to maintain accessibility and uptime even during maintenance activities, though they may implement certain restrictions based on their configurations. Thus, maintenance mode is the distinctly correct choice here due to its defined purpose of blocking access and silencing alerts during crucial operational tasks.