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.

The next step after defining tasks, durations, resources, and costs is to establish baselines. A baseline is an approved version of a project plan that serves as a reference point for measuring progress and performance throughout the project lifecycle. A baseline typically includes scope, schedule, cost, quality, and risk parameters. Establishing baselines involves presenting the project plan to key stakeholders and obtaining their formal agreement on the project objectives and deliverables. Baseline approval can help to establish clear expectations, avoid scope creep, and facilitate change control during project execution34

Assess the impact of the request and create a change request. The project manager should assess the impact of the request and create a change request in response to the stakeholder asking to add mobile device functionality to a project that is on track to be completed under budget and ahead of schedule. A change request is a document that formally proposes and records a modification or addition to some aspect of a project, such as scope, schedule, cost, quality, or resources. A change request can help to communicate and justify the need and rationale for the change and its implications on the project objectives and deliverables. A change request also helps to initiate the change control process, which involves reviewing, approving, implementing, and monitoring the change12

A project manager did not release the resources. A project manager not releasing the resources could most likely be the cause of this issue where several employees' allocations from the past month appear to be 200% even though they are only assigned to a particular project. Releasing resources is a process of freeing up or reallocating any human or material resources that were used for a project after its completion or closure. Releasing resources can help to update the resource availability and utilization records and avoid any conflicts or errors in resource allocation or reporting.

In order to find the client billing rate for a particular engineer, the project manager would need to refer to the SOW (Statement of Work). The SOW is a document that outlines the work to be performed, the timeframe for completion, and the cost of the project. It also includes information about the resources involved in the project and their billing rates. References: CompTIA Project+ Study Guide Section 2.2.
The project manager would need a statement of work (SOW) to find information about the client billing rate for a particular engineer. A SOW is a document that defines the scope of work for a project or contract. It usually includes information such as deliverables, milestones, timeline, costs, payment terms, quality standards, and acceptance criteria. A SOW can help to specify what services or products will be provided by whom, when, where, how, and for how much.