Presentation, application, and data processing. Presentation, application, and data processing are the three logical and physical computing tiers that make up a three-tier architecture. A three-tier architecture is a type of software architecture that separates an application into three layers or tiers that run on different servers or machines. Each tier performs a specific function or role and communicates with other tiers through well-defined interfaces. The presentation tier is the user interface and communication layer of the application, where the end user interacts with the application. The application tier is the logic or middle tier of the application, where data is processed using business rules. The data processing tier is the data or back-end tier of the application, where data is stored and managed12

Explanation
The project manager should review the communication plan after learning about some communication issues with different stakeholders and team members. A communication plan is a document that defines and documents the communication goals, strategies, methods, channels, frequency, roles, and responsibilities for a project. A communication plan can help to facilitate effective and timely communication among all stakeholders involved in a project and avoid confusion, misunderstanding, or conflicts.

The next step in the process after defining tasks, durations, resources, and costs is to seek baseline approval. 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. Seeking baseline approval 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 execution.
The NEXT step after defining tasks, durations, resources, and costs during the planning phase is to seek baseline approval. Baseline approval involves finalizing the project plan and gaining approval from stakeholders, establishing the plan as the baseline for the project's performance. References: CompTIA Project+ Study Guide Section 3.4.1

Before starting a new project that involves personal data, the project manager should first understand the relevant privacy regulations that apply to the data subjects, the data controllers, and the data processors. These regulations may vary depending on the location, industry, and nature of the data. For example, GDPR applies to any project that processes the personal data of individuals in the European Union, regardless of where the project is based or executed. Understanding the applicable privacy regulations will help the project manager to identify the legal obligations, risks, and compliance requirements for the project data. References = CompTIA Project+ Study Guide, Chapter 3: Project Planning, Section 3.4: Data Privacy and Security, p. 121-122; A Project Management Approach to Data Protection Compliance; 10 Data Protection Considerations Before Starting a New Project; Project Teams Must Manage Risk and New Requirements to Ensure Data Privacy

This answer is based on the understanding that outsourcing is a form of procurement, which is one of the knowledge areas in project management. Procurement involves acquiring goods and services from external sources to support the project objectives. According to the CompTIA Project+ Study Guide1, procurement activities occur mainly in the planning phase of the project, where the project manager identifies the project needs, defines the scope of work, evaluates the potential vendors, and prepares the procurement documents.
The other options are not correct because:
Initiating is the phase where the project manager defines the project purpose, objectives, and deliverables, and obtains the project charter and stakeholder approval. Initiating does not involve procurement activities, although it may involve some preliminary research on the feasibility and availability of external resources.
Controlling is the phase where the project manager monitors and measures the project performance, compares it with the baseline, and implements corrective actions if needed. Controlling does involve some procurement activities, such as reviewing the vendor deliverables, managing the changes, and resolving the issues, but these are not the main tasks of procurement.
Executing is the phase where the project manager leads and directs the project team and other resources to complete the project work according to the plan. Executing does involve some procurement activities, such as selecting the vendor, signing the contract, and managing the relationship, but these are not the main tasks of procurement. References = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 8: Planning Projects, Part 4 (Procurement and Communication), pages 243-260; CompTIA Project+ Certification Exam Objectives, Domain 2: Project Planning, Objective 2.5: Given a scenario, plan procurement for a project.