2. what is the reliability of the following system? 3. twelve routers used in computer networks are load tested. one router has a breakdown after 4600 hours, a second router has a breakdown after 5000 hours, and three other units breakdown at 6500, 7250, and 8500 hours. other units continue operation until the test is terminated at 12000 hours. what is the mtbf for the router based on the test results? 0.95 0.9 0.95 0.95