To answer this question, you need to understand the ASP.NET directive for caching pages.
Option A) @OutputCache - This option is correct. The @OutputCache directive in ASP.NET allows you to cache different versions of a page based on varying input parameters, HTTP headers, and browser type. It is used to improve performance by caching the output of a page or user control.
Option B) @CacheOutput - This option is incorrect. There is no such directive in ASP.NET called @CacheOutput.
Option C) @PageCache - This option is incorrect. There is no such directive in ASP.NET called @PageCache.
Option D) @CacheAll - This option is incorrect. There is no such directive in ASP.NET called @CacheAll.
The correct answer is option A) @OutputCache. This option is correct because the @OutputCache directive is used to cache different versions of a page based on varying input parameters, HTTP headers, and browser type.