The Compact Layout in Salesforce mobile app configuration determines the fields that appear at the top of the record in the mobile app, providing quick access to key information.
Reference:
Salesforce Help - Compact Layouts

A geolocation field can be used to capture the coordinates of a location in latitude and longitude. This field type can also be used in reports, formulas, validation rules, and Apex

The app builder should use a custom button and Flow to achieve the desired result. A custom button is a button that can invoke custom logic or actions when clicked by a user. A Flow is a type of automation tool that can guide users through a series of screens and perform actions based on user input. In this case, the app builder can create a custom button on the Account object that launches a Flow when clicked by a user. The Flow can display a popup window with questions for the user to answer and populate additional fields on the Account record based on the user input4. Option A, B, and C are not tools that can achieve this result.

The app builder should use three features to meet the business requirements:
Process Builder: This is a type of automation tool that can execute actions based on certain criteria. In this case, the process builder can have a criteria that evaluates if an opportunity is in the Secure Commitment Stage, and then execute an action that submits it for approval.
Apex: This is a programming language that allows developers to execute complex logic on the Salesforce platform. Apex can be used to create triggers that run before or after certain events, such as insert, update, delete, or undelete of records. In this case, Apex can be used to create a trigger that runs before an opportunity is updated and submits it for approval if it is in the Secure Commitment Stage.
Flow: This is another type of automation tool that can guide users through a series of screens and perform actions based on user input. Flow can also be triggered by certain events, such as when a record is created or updated. In this case, Flow can be used to create a record-triggered flow that runs after an opportunity is updated and submits it for approval if it is in the Secure Commitment Stage. Option A and D are not features that can meet the business requirements.

Lookup is the type of relationship that would be set up to meet the specification of pairing experienced Realtors with new Realtors. According to the Salesforce documentation, "A lookup relationship creates a loose association between objects. The lookup field allows users to select a record from another object." Indirect lookup is used for junction objects on different platforms. Many-to-many is not a type of relationship, but a result of using junction objects. Master-detail is used for creating parent-child relationships.