If there are only enough funds to duplicate two processes, which two processes should be duplicated to achieve the most increase in reliability?

a$.$ Processes A and $B.$

b$.$ Processes A and $C.$

c$.$ Processes B and C$.$

d$.$ Any two processes will result in the same improvement.

Which of the following statements is least accurate?

a$.$ Duplicating any process that has reliability less than $1\mathrm{.}0$ will improve the overall system reliability.

b$.$ Duplicating the process that is least reliable will have the most effect on the overall system reliability.

c$.$ Selection of processes to duplicate should be based only on how much it would improve system reliability.

d$.$ Duplicating two processes with reliabilities less than $1\mathrm{.}0$ will improve system reliability more than duplicating just one of those two.