See the solution below in explanation.
Explanation:

An RFP (request for proposal) is a document that solicits proposals from potential vendors for a specific project or service. An RFP typically describes the project scope, requirements, evaluation criteria, and instructions for submitting proposals. An RFP is the best document for the company to use to obtain and compare information on cabling services and costs from various vendors, as it allows the company to evaluate the vendors' qualifications, experience, approach, and pricing12.

A statement of work (SOW) is a formal document that defines the entire scope of work involved for a vendor and clarifies deliverables, costs, and timeline1. It serves as a contractual agreement between a vendor and a client, providing a comprehensive description of the work to be performed2. A reason to use a SOW on a project is to ensure the team stays within the scope of the contract, as it outlines what the team will and won't do on a project, saving from painful client negotiations and protecting the timeline and the bottom line3. References = CompTIA Project+ PK0-005 Certification Study Guide, Chapter 3: Initiating Projects Part
1, page 63; What Is a Statement of Work? Definition & Examples, Introduction and What Is a Statement of Work (SOW) In Project Management? sections; Statement Of Work Ultimate Guide: Simple Definition & Template, Introduction and What is a Statement of Work? sections; What Is a Statement of Work (SOW)? - Coursera, Introduction section.

Agile is a project management methodology that emphasizes customer collaboration, feedback, and adaptation throughout the project life cycle. Agile teams work in short iterations, called sprints, and deliver working increments of the product or service to the customer for review and approval. Agile teams can also respond to changing requirements and priorities by adjusting the scope, schedule, or quality of the project12.
Waterfall, on the other hand, is a project management methodology that follows a linear and sequential process, where each phase of the project must be completed before moving on to the next one. Waterfall teams work with a fixed scope, schedule, and quality, and deliver the final product or service to the customer at the end of the project. Waterfall teams have less customer involvement and flexibility during the project development34.

Control objectives are the desired outcomes or goals of implementing security controls to mitigate risks and protect information assets. Control objectives should be the primary basis for establishing metrics that measure the effectiveness of an information security program, as they align with the business objectives, requirements, and expectations of the organization and its stakeholders. Metrics based on control objectives can help to evaluate the performance, efficiency, and maturity of the security program, and to identify gaps, issues, and areas for improvement. The other options are not correct because:
Residual risk is the remaining risk after applying security controls. Residual risk is not a basis for establishing metrics, but rather a result of measuring the effectiveness of security controls. Residual risk should be monitored and reported, but it does not define the desired outcomes or goals of the security program.
Regulatory requirements are the external standards, laws, and regulations that the organization must comply with to avoid legal or financial penalties. Regulatory requirements are not a basis for establishing metrics, but rather a constraint or a driver for the security program. Metrics based on regulatory requirements can help to demonstrate compliance, but they may not reflect the actual effectiveness or efficiency of the security program.
Risk tolerance is the level of risk that the organization is willing to accept or bear. Risk tolerance is not a basis for establishing metrics, but rather a factor or an input for the security program. Metrics based on risk tolerance can help to prioritize and allocate resources, but they may not measure the actual outcomes or goals of the security program. References = Key Performance Indicators for Security Governance, Part 1; 14 Cybersecurity Metrics + KPIs You Must Track in 2023; KPIs in Information Security: The 10 Most Important SecurityMetrics; Why metrics are crucial to proving cybersecurity programs' value; Implementing and Maintaining Security Program Metrics