A computerized sewing machine has four independent parts: mechanical, circuit board, touch screen, and power control. The probability that each wil fail within the first year is 0.01, 0.02, 0.001, and 0.03, respectively. If one of them fails then the machine does not work. What is the approximate probability that the machine is still working at the end of the first year? 
选项为:A:$$0.930$$  B:$$0.939$$  C:$$0.940$$  D:$$0.960$$  E:greater than 99\%  请回答其中一个选项.