Explanation
Sales rep B has implicit access to the Account because of the manual sharing of the Opportunity. Implicit sharing grants access to parent records when a user has access to a child record. Sales rep B was not added to the Account team, sharing set is not applicable for private sharing model, and Account was not manually shared.

Explanation
The app builder should add the field to the custom report type field layout to troubleshoot this issue. A custom report type is a type of report that defines which objects and fields are available for reporting. The app builder can customize which fields are included in each custom report type by editing its field layout. If a new field is added to an object that is part of an unmanaged package, it will not be automatically added to the custom report type field layout. The app builder needs to manually add it to make it available as an option to add as a column in reports based on that custom report type. Option A, B, and D are not steps that can troubleshoot this issue.

Explanation
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

Explanation
To insert a list of 25,000 records using deduplication for the Race_Track__c custom object, an app builder should use Data Loader. Data Loader is a tool that allows users to insert, update, delete, or export large amounts of data in Salesforce. Data Loader can also perform deduplication by matching records based on external ID fields or Salesforce record IDs. [Source]

Explanation
The app builder should go to the Account object to build these new rollups. A roll-up summary field is a type of field that can aggregate numeric values from child records related to a parent record by a master-detail relationship. The app builder can create two roll-up summary fields on the Account object that count the number of open Opportunities and the number of won Opportunities related to each Account. Lightning App Builder is not a place where the app builder can build these new rollups. Lightning App Builder is a tool that allows the app builder to customize the layout and components of Lightning pages, such as record pages, home pages, or app pages. It cannot create new fields or relationships on objects. Lightning Object Creator is not a place where the app builder can build these new rollups. Lightning Object Creator is a tool that allows the app builder to create custom objects from spreadsheet data by uploading a file and mapping columns to fields. It cannot create roll-up summary fields or relationships on existing objects. Opportunity object is not a place where the app builder can build these new rollups. The Opportunity object is the child object in the relationship with the Account object, and roll-up summary fields can only be created on the parent object.