2.1. When we were discussing floating point addition, we made the simplifying Suppose that fetch and store each take 2 nanoseconds and the remaining operations each take 1 nanosecond. a. How long does a floating point addition take with these assumptions'? b. How long will an unpipelined addition of 1000 pairs of floats take with these assumptions? c. How long will a pipelined addition of 1000 pairs of floats take with these assumptions? d. The time required for fetch and store may vary considerably if the operands/ results are stored in different levels of the memory hierarchy. Suppose that a fetch from a level 1 cache takes two nanoseconds, while a fetch from a level 2 cache takes five nanoseconds, and a fetch from main memory takes fifty nanoseconds. What happens to the pipeline when there is a level 1 cache miss on a fetch of one of the operands? What happens when there is a level 2 miss