Which two events need to happen when deploying to a production org? Choose 2 answers

What must the Controller for a Visualforce page utilize to override the Standard Opportunity view button?

A Visualforce page is required for displaying and editing Case records that includes both standard and custom functionality defined in an Apex class called myControllerExtension.
The Visualforce page should include which <apex:page> attribute(s) to correctly implement controller functionality?

Universal Containers (UC) decided it will not send emails to support personnel directly from Salesforce in the event that an unhandled exception occurs. Instead, UC wants an external system be notified of the error.
What is the appropriate publish/subscribe logic to meet these requirements?

A developer writes a trigger on the Account object on the before update event that increments a count field. A workflow rule also increments the count field every time that an Account is created or update.
The field update in the workflow rule is configured to not re-evaluate workflow rules. What is the value of the count field if an Account is inserted with an initial value of zero, assuming no other automation logic is implemented on the Account?