Consider the system shown below, which consists of eight components with the following reliabilities: A1 = A2 = A3 = 0.72 B = 0.96 C1 = C2 = 0.87 C3 = C4 = 0.91 The system reliability = 0.898 Assuming that the exponential model holds for all components and that the reliabilities given are for 100 hours of operation, the system MTBF is [ Select ] C1 Ca C2 CA