Component choice A product can be realized according to two non-redundant and functionally equivalent structures which use components of reliability laws with constant failure rate. The first solution SI has:

- 12 components with a failure rate of 10'7,

- 1 component with a failure rate of 10'6,

- and 3 components with a failure rate of 10'5.

The second solution S2 has 4 components with a failure rate of 10'6.

Which one is the best choice from the reliability point of view?