Explanation
A functional requirements specification (FRS) is a document that defines what features and functions a system should provide to meet the business needs and objectives. It describes how users will interact with the system and what outcomes they expect from it. An FRS typically includes use cases, user stories, acceptance criteria, data models, business rules, workflows, diagrams, mockups, and other details that describe how the system should work. A BA should create an FRS to define the enhancement features for the current Salesforce CPQ implementation that must be configured in the next phase of the project.
References:https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-functional-requirements/

Explanation
This answer states that creating a capability map detailing the functionality of Salesforce and AppExchange Quote-to-Cash products is the type of document that the BA should present to the stakeholders who want to explore automating NTO's Quote-to-Cash process. A capability map is a diagram that shows what an organization does at a high level of abstraction, without going into details of how it does it. A capability map can help the BA to present to the stakeholders how Salesforce and AppExchange Quote-to-Cash products can support their business activities or functions related to generating quotes, contracts, orders, invoices, and payments. A capability map can also help the BA to align the potential solutions with the business goals and strategies of NTO.
References:https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use