Consider a computer system that has 2 processors and 2 memory units. For the system to be considered completely operational, all the processors and all the memory units should be up. The system is considered to operate in a degraded mode if one of the processors or/and one of the memory units is non-operational or failed. The system is considered to have failed if both the processors or/and both the memory units have failed. Assume that a processor fails at the rate lp and is repaired at the rate mp, and a memory unit fails at the rate lm and is repaired at the rate mm. Both the CPU and the memory units have a dedicated repair facility, with the capability of repairing only one failed component at a time. Also, assume that once the system reaches as a failed state, the other components that are operational cannot fail any further. Draw the availability model of the computer system and identify the states in the model in which the system is completely operational, degraded and failed.