Record-triggered flow is the automation tool that the app builder should use to best address all these requests of sending an email to the finance manager and creating a task for the sales manager when a new client is won. According to the Salesforce documentation, "Record-triggered flows automate processes for you. They start when a record is created or updated, or when a platform event occurs." A record-triggered flow can perform actions such as sending an email alert or creating a record based on criteria or conditions. Screen flow, Apex, and Approval process are not automation tools that can handle all these requests.

The Invoice Number field should be a Text field and marked as a unique external ID field. This will allow the migration of invoices from an external system while maintaining their original Invoice Number. It will also ensure that each new Invoice created in Salesforce has a unique Invoice Number.

The steps that the app builder should take to meet these requirements are creating a Partial Copy Sandbox and using a sandbox template. A Partial Copy Sandbox can include data records, exclude confidential objects, and be refreshed weekly. A sandbox template can specify which objects and data are copied from the production org to the sandbox org. Option A is incorrect because creating a Full Sandbox and using a sandbox template is not necessary for this requirement, as Full Sandboxes copy all data and metadata from the production org and can only be refreshed every 29 days. Option B is incorrect because creating a Developer Pro Sandbox and scheduling Data Loader to download selected object data weekly is not feasible for this requirement, as Developer Pro Sandboxes do not include data records by default and Data Loader cannot be scheduled to run weekly. Option D is incorrect because creating a Developer Sandbox and scheduling Data Loader to download selected object data weekly is not feasible for this requirement, as Developer Sandboxes do not include data records by default and Data Loader cannot be scheduled to run weekly.

To facilitate quick managerial sign-off on discounted opportunities:
B . Dynamic Actions: Allows the display of specific actions on the Opportunity record page based on certain conditions, like the discount percentage.
D . Approval Process: Configures a formal sign-off process for records meeting specific criteria, such as discount ranges between 20% to 30%.
Steps to set up:
Configure an approval process for opportunities where the discount is between 20% and 30%.
Use Dynamic Actions to conditionally show the approval action directly on the Opportunity record page based on the discount percentage.
This setup allows sales managers to efficiently review and approve discounted deals directly from the Opportunity record page.
For guidance on setting up approval processes and dynamic actions, refer to Dynamic Actions in Salesforce.

To troubleshoot the issue of a contact being unavailable for other users to see, an app builder should check the following things:
Confirm whether Default Organization-Wide Sharing Settings provide access to the Account. This setting determines the baseline level of access that users have to each other's records.
Review the Contact record and ensure it is linked to an Account. Contacts that are not linked to an account are private and only visible to the owner and administrators.
Verify the users with the issue have access to the Contact object. Users need to have at least read permission on the Contact object to view contact records. Option A and E are not relevant for troubleshooting this issue.