The project scope is the document that defines and describes the project objectives, deliverables, requirements, boundaries, assumptions, and constraints. It also includes the success criteria that should be fulfilled by the product or service to meet the stakeholder expectations and the business case. The success criteria are the measurable standards that indicate whether the project has achieved its intended results. The other options are not correct because:
A quality plan is the document that defines and describes the quality standards, policies, procedures, tools, and techniques that will be applied to the project to ensure that the deliverables meet the requirements and the success criteria.
Contract obligations are the terms and conditions that bind the parties involved in a contractual agreement, such as the project manager, the customer, the sponsor, and the vendor. Contract obligations specify the roles, responsibilities, deliverables, payments, and penalties of each party.
A work breakdown structure (WBS) is a graphical representation of the project scope that breaks down the deliverables into smaller and manageable components. A WBS shows the hierarchy and relationship of the project elements, but does not include the success criteria. Reference = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 6: Planning Projects, Part 2 (Scope, Quality, and Risk), pages 175-179; CompTIA Project+ Certification Exam Objectives, Domain 2: Project Planning, Objective 2.1: Given a scenario, create a project charter and project management plan.

Obtaining approval for changes to software is crucial to ensure that the changes do not negatively impact other functionalities of the software. Approval processes typically involve a review that assesses the potential impacts of the change, which helps in mitigating risks associated with the change.
References = The answer is based on standard project management practices and the typical use of change control processes in software development. For detailed information, please refer to the CompTIA Project+ Study Guide and other official CompTIA resources.

Explanation
The system is lacking proper access controls if a third-party vendor was able to see secured project information in a recently implemented system that resulted in a fine for the organization. Access controls are security mechanisms that regulate who or what can view, use, or modify data or resources in a system or network. Access controls typically involve authentication and authorization processes that verify the identity and permissions of users or devices before granting them access. Access controls can help to protect data confidentiality, integrity, and availability and prevent unauthorized access, misuse, or theft12

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.

Explanation
Electronic document and record management systems would be the best software solutions to help an institution manage the internal flow for formally responding in writing to citizens' complaints. Electronic document and record management systems are software systems thathelp organizations create, store, organize, manage, track, and distribute electronic documents and records. Electronic document and record management systems can help to improve efficiency, productivity, collaboration, compliance, and security of document and record management processes and workflows