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.

Customer notification should be added to the issue log after receiving an escalation from an executive about
the extension of the downtime after the scheduled window. Customer notification is a communication activity
that informs the customers about any issues or changes that may affect their satisfaction or expectations.
Customer notification can help to maintain trust, transparency, and goodwill with the customers and prevent
any negative impacts on their business operations or experience.

The project manager should put in place a time and materials contract before work begins for a third party that
needs to perform a short-term task for which the duration cannot be accurately estimated and the cost cannot
be calculated in advance. A time and materials contract is a type of contract where the buyer pays the seller
based on the actual time spent and materials used during the project. A time and materials contract is suitable
for projects that have uncertain or variable scope, duration, or cost. A time and materials contract can provide
flexibility and adaptability for both parties and allow them to adjust to changing requirements or
circumstances.

The critical path is the sequence of tasks that determines the minimum project duration. It is the longest path through the network diagram and has the least amount of slack or float. Based on the provided network diagram, the critical path is A-C-G-K-M, which has the longest total duration when adding up the individual task durations. References = The concept of the critical path is covered in the CompTIA Project+ Certification Study Guide1. For more detailed information on how to calculate and identify the critical path in project management, you can refer to the study guide and other project management resources2.

The SOW (statement of work) is a document that defines the scope, deliverables, schedule, and resources of a project. It is a contractual agreement between the buyer and the seller that should be changed first when there are approved changes to the product. Changing the SOW will ensure that the project expectations and requirements are updated and aligned with the customer's requests. The other options are not documents that need to be changed first, but rather metrics or tools that can be used to measure or manage the project.
References = CompTIA Project+ PK0-005 Certification Study Guide, Chapter 3: Initiating Projects; CompTIA Project+ Certification Exam Objectives, Domain 2: Project Planning, Objective 2.1: Develop a project scope document.