Explanation
Scrum requires the most availability from the business team among the given options. Scrum is a popular agile framework that organizes work into short iterations called sprints, usually lasting one to four weeks. Scrum emphasizes collaboration between teams, customers, and stakeholders and encourages open communication and transparency throughout the project lifecycle. Scrum requires frequent involvement and feedback from the business team through activities such as product backlog refinement, sprint planning, sprint review, sprint retrospective, and daily scrum meetings.

Explanation
The project manager should make an impact assessment after being informed that the delivery of required IT equipment will be delayed. An impact assessment is a process of analyzing and evaluating how a change or an issue may affect the scope, schedule, cost, quality, or risks of a project. An impact assessment can help to determine the severity and implications of the delay on the project objectives and deliverables and identify any possible alternatives or corrective actions to minimize or avoid its negative effects.

Scrum requires the most availability from the business team among the given options. Scrum is a popular agile
framework that organizes work into short iterations called sprints, usually lasting one to four weeks. Scrum
emphasizes collaboration between teams, customers, and stakeholders and encourages open communication
and transparency throughout the project lifecycle. Scrum requires frequent involvement and feedback from the
business team through activities such as product backlog refinement, sprint planning, sprint review, sprint
retrospective, and daily scrum meetings.

The project manager should develop a rollback plan next after determining the appropriate maintenance
window in the operational infrastructure change process. A rollback plan is a contingency plan that describes
how to revert to the previous state of the system or infrastructure in case of a failure or disruption during the
change implementation. A rollback plan can help to minimize the impact and risk of the change and ensure
business continuity and stability.

A milestone chart is the best chart to use to show major accomplishments for key events, because it displays
the important deliverables or outcomes of a project along a timeline12. A milestone chart can provide a
high-level overview of the project progress and achievements, without showing the details of each task or
activity34. A milestone chart can also help communicate the project status and expectations to the
stakeholders, and identify any potential risks or delays that may affect the project completion56. References =
CompTIA Project+ Certification Study Guide7, CompTIA Project+ Certification Exam Objectives8, What is a
Milestone Chart?1, How to Create a Milestone Chart in Excel in 3 Steps2, Milestone Chart: The Easiest Way
to Track Project Milestones3, How to Use Milestones in Project Management4