Explanation
Two options that the administrator should check to ensure the product is available are:
Confirm the correct price book is selected on the opportunity. A price book is a list of products and their prices that can be added to an opportunity. An opportunity can have only one price book at a time, and the products that are available for selection depend on the price book that is chosen. Therefore, the administrator should check if the opportunity has the right price book that contains the new keyboard product.
Ensure the product is associated with the correct price book. A product is a good or service that can be sold in Salesforce. A product can be associated with one or more price books, depending on how it is priced for different markets or segments. Therefore, the administrator should check if the new keyboard product is added to the appropriate price book that is used by the opportunity.
The other two options are incorrect because:
Making custom fields does not affect the availability of products on an opportunity. Custom fields are used to store additional information or calculations on an object, but they do not determine which products can be selected from a price book.
Turning on field tracking does not affect the availability of products on an opportunity. Field tracking is used to monitor changes to certain fields on an object and display them in a history related list, but it does not determine which products can be selected from a price book.
References: https://help.salesforce.com/s/articleView?id=sf.products_pricebooks.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.products_define.htm&type=5

Explanation
Flow is the automation tool that should be configured to utilize the major listing service endpoint. Flow is a tool that allows administrators to automate complex business processes by building flows that can collect, update, or delete data, invoke Apex code, call external services, and more. Flow can use an Apex action or an HTTP request action to send messages to an external endpoint using REST API

Explanation
Changing the record type of a record does not affect the record access of a user. Record access is determined by the organization-wide default, role hierarchy, sharing rules, manual sharing, teams, and ownership. Record type only affects the page layout and picklist values that are available for the record. Therefore, if a user has access to a record before changing its record type, they will still have the same access after changing its record type. References: https://help.salesforce.com/s/articleView?id=sf.customize_recordtype.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.security_sharing_overview.htm&type=5

Explanation
Sharing rules are automatic exceptions to organization-wide sharing settings that grant additional access to records based on record ownership or criteria. By creating a sharing rule on the Account object for all members of the account services role to have Read/Write access, the administrator can allow users in that role to edit and change ownership of Accounts owned by any of their team members, regardless of the organization-wide sharing setting for Account. References:
https://help.salesforce.com/s/articleView?id=sf.security_sharing_rules.htm&type=5

Explanation
An authentication app is a mobile app that generates verification codes for logging in to Salesforce or other services that require multi-factor authentication (MFA). A username and password are also required for logging in to Salesforce, but they are not sufficient for MFA. References:
https://help.salesforce.com/s/articleView?id=sf.identity_auth_apps.htm&type=5