you are implementing a method in an asp net application that includes..., Appendix, ASP.NET

Question:You are implementing a method in an ASP.NET application that includes the following requirements.
*Store the number of active bugs in the cache.
*The value should remain in the cache when there are calls more often than every 15 seconds.
*The value should be removed from the cache after 60 seconds.

You need to add code to meet the requirements.
Which code segment should you add?

A Cache.Insert("ActiveBugs", result, null, DateTime.Now.AddSeconds(60), TimeSpan.FromSeconds(15)); 
B Cache.Insert("Trigger", DateTime.Now, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration);
CacheDependency cd = new CacheDependency(null, new string[] { "Trigger" });
Cache.Insert("ActiveBugs", result, cd, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15)); 
C Cache.Insert("ActiveBugs", result, null, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15));
CacheDependency cd = new CacheDependency(null, new string[] { "ActiveBugs" });
Cache.Insert("Trigger", DateTime.Now, cd, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration); 
D CacheDependency cd = new CacheDependency(null, new string[] { "Trigger" });
Cache.Insert("Trigger", DateTime.Now, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration);
Cache.Insert("ActiveBugs", result, cd, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15));

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A Cache.Insert("ActiveBugs", result, null, DateTime.Now.AddSeconds(60), TimeSpan.FromSeconds(15));

B Cache.Insert("Trigger", DateTime.Now, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration); CacheDependency cd = new CacheDependency(null, new string[] { "Trigger" }); Cache.Insert("ActiveBugs", result, cd, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15));

C Cache.Insert("ActiveBugs", result, null, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15)); CacheDependency cd = new CacheDependency(null, new string[] { "ActiveBugs" }); Cache.Insert("Trigger", DateTime.Now, cd, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration);

D CacheDependency cd = new CacheDependency(null, new string[] { "Trigger" }); Cache.Insert("Trigger", DateTime.Now, null, DateTime.Now.AddSeconds(60), Cache.NoSlidingExpiration); Cache.Insert("ActiveBugs", result, cd, Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(15));

B