Link-State Best Loop Free Path Calculation

[UncleJP]

Studying for ENCOR, I ran across this question:

A link-state routing protocol finds the best loop free path by using ______.
a. hop count
b. bandwidth
c. delay
d. interface cost
e. path attributes

Answer: E

I did some research, so I could clear my confusion. 

https://www.omnisecu.com/cisco-certified-network-associate-ccna/what-is-ospf-metric-value-cost-and-ospf-default-cost-reference-bandwidth.php

This site states that OSPF, a link-state protocol, uses cost, derived from bandwidth, to find the best path. Is this a bad question, or am I missing something? Any feedback is appreciated.

[UncleJP · Accepted solution]

Thread: https://community.cisco.com/t5/routing/link-state-best-loop-free-path-calculation/m-p/4073595

[Martin L]

It is not that bad;  I figure out after looking couple times:

RIP uses hop count; EIGRP will bandwidth and delay; BGP will use path attributes;

what is left is interface cost.

OSPF uses cost based on interface bandwidth. So, I guess the answer is interface cost.