Hi ,
Please help me answering below questions.
1. What must the Controller for a Visualforce page utilize to override the Standard
Opportunity view button?
A. The StandardSetController to support related lists for pagination.
B. the Opportunity StandardController for pre -built functionality.
C. A callback constructor to reference the StandardController.
D.A constructor that intrializes a private Opportunity variable.
Confused between Answer B and C

2.what is a correct pattern to follow when programming in Apex on a Multi -tenant
platform?
A. Apex code is created in a separate environment from schema to reduce deployment
errors.
B.DML is performed on one record at a time to avoid possible data concurrency issues.
C. Queries select the fewest fields and records possible to avoid exceeding
governor limits.
D. Apex classes use the ''with sharing" keyword to prevent access from other server
tenants.
I think Answer is C

3.How can a developer refer to, or instantiate, a PageReference in Apex?
Choose 2 answers
A. By using a PageReference with a partial or full URL.
B. By using the Page object and a Visualforce page name.
C. By using the ApexPages.Page() method with a Visualforce page name.
D. By using the PageReference.Page() method with a partial or full URL.
I think Answer A,B

4.What can the developer do to successfully deploy the new Visualforce page and
extension?
A. Create test classes to exercise the Visualforce page markup.
B. Select "Disable Parallel Apex Testing" to run all the tests.
C. Add test methods to existing test classes from previous deployments.
D. Select "Fast Deployment'' to bypass running all the tests.
Answer D

5. When can a developer use a custom Visualforce page in a Force.com application?
Choose 2 answers
A. To create components for dashboards and layouts.
B. To deploy components between two organizations.
C. To generate a PDF document with application data.
D. To modify the page layout settings for a custom object.
Answer A, C

6. Which statement about the Lookup Relationship between a Custom Object and a
Standard Object is correct?
A. The Lookup Relationship on the Custom Object can prevent the deletion of the
Standard Object.
B. The Lookup Relationship cat:That be marked as required on the page layout for the
Custom Object.
C. The Custom Object will be deleted when the referenced Standard Object is
deleted.
D. The Custom Object inherits security from the referenced Standard Objects
Answer C

Please clarify these questions.