Which of the following captures all of the activities within a business, the inputs and outputs of each activity, and the required resources to complete each activity?

Which of the following is mandatory in most software development projects?

You are the business analyst for your organization and are with another business analyst, Steve, on the requirements elicitation for a new solution. You warn Steve that you'll need to be tracing the requirements in an effort to prevent scope creep.
What is scope creep?

You are the business analyst for your organization. As part of the requirements prioritization you have given each key stakeholder $10,000 in play money to distribute among the identified requirements. Each stakeholder can assign their play money to any of the requirements, but the requirements will be prioritized based on the value of the play money assigned to each requirement.
What type of requirements prioritization is happening in this scenario?

A business analyst (BA) is planning for an upcoming solution based on a signed contract with a client but has learned that one of the key subject matter experts is unavailable during the first half of the business analysis phase. The project has a tight timeline and firm deadline that is part of the contract. There are no substitutes for the key subject matter expert.
How should the BA proceed?