Adeveloper creates a new visualforce page and apex extension, and writes test classes that exercise 95% coverage of the new apex extension. change set deployment to production fails with the test coverage warning: "average test coverage across all apex classes and triggers is 74%, at least 75% test coverage is required."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

The correct option to the following question is C.).

Explanation:

A web page that belongs to the salesforce is called the visualforce page.

The controller extension is Apex class containing the constructor which takes the single argument of the type Apex Pages. StandardController or the CustomControllerName, where the CustomControllerName is a name of the custom controllers which you wants to extend.

With power of the Apex and the Visualforce page, you can easily customize the feel and look of the knowledge base, for example, with the custom search page or the robust articles publishing cycle.

answer; certification; plz check first, i believe this is correct. good luck;