which two circustances can cause collision domain issues on vlan domain?

a. duplex mismatches on ethernet segments in the same vlan
b. multiple errors on switchport interfaces
c. congestion on the switch inband path
d. a failing nic in an end device
e. an overloaded shared segment
I think that the options are a,e. But many say that the option c is matching. Has anyone got any idea about collision domain?

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