A project manager needs to determine resource availability to assign the resources to project tasks. Which of the following will the project manager MOST likely use?

Resource calendars document the working days, hours, holidays, and any pre-committed time for each resource, allowing the project manager to determine when a specific resource is actually free to be assigned to a task. They are the primary tool for resource availability analysis and prevent over-allocation by making conflicts visible before assignment. Without resource calendars, a project manager cannot reliably assign work without risking scheduling conflicts.

A project calendar defines the overall working days and hours for the project as a whole, but does not reflect the individual availability or constraints of specific resources.

A staffing management plan describes how team members will be acquired, developed, managed, and released over the project lifecycle, not their day-to-day or hour-to-hour availability.

Conflict resolution is a human resource and team management technique for interpersonal disputes and is unrelated to determining when resources are available for task assignment.