Regarding the cost of the routing protocol, which of the following description is incorrect?

Regarding the cost of the routing protocol, which of the following description is incorrect?
A . Because different routing protocols have different basis for calculating route costs, automatic conversion is generally recommended when routes are imported.
B . Because different routing protocols have different basis for calculating route costs, manual configuration is generally recommended when routes are imported.
C . Generally, the cost of ISIS and OSPF is based on the bandwidth. The value range is very large.
D . Usually the cost of RIP is based on the number of hops and the range of values is small.

Answer: A