Considering the reliability of the access network, how would you plan the cost value of each link in the OSPF area?

In the access architecture of an IP bearer network, the OSPF protocol is enabled between two access routers, two firewalls (in transparent mode), and two Layer 3 switches. Softswitches work in active/standby mode. VRRP is enabled between the softswitches to provide a gateway. In normalcases, SW1 is the master router and SW2 is the backup router.

Considering the reliability of the access network, how would you plan the cost value of each link in the OSPF area?
A . a=b=c=d
B . c>a+b+d
C . d>a+b+c
D . a=b>c=d

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Answer: C