Consider two systems, C and D. System C has three serial components each with reliabilities of 0.95. Two of the components have backups with reliabilities of 0.90. System D has three serial components with reliabilities of 0.90. Each of these components has a backup with a 0.90 reliability. If each 0.90 reliable component costs $1000, each 0.95 component costs $2000, and the cost of failure is $10,000, what is the approximate cost of system C?
A. $6300
B. $7400
C. $8595
D. $9700