Which statement describes a typical purpose of iRules?

A: iRules can be used to add individual control characters to an HTTP data stream. B: iRules can be used to update the timers on monitors as a server load changes. C: iRules can examine a server response and remove it from a pool if the response is unexpected. D: iRules can be used to look at client requests and server responses to choose a pool member to select for load balancing