What kind of primary does the following scenario describe?

Question

A candidate competes in a state’s presidential primary and wins 26 percent of the popular vote.
Twenty­six percent of the state’s delegates are officially pledged to vote for that candidate at
the national party convention.

primary with winner­take all rules
primary with proportional*** representation rules
preference primary
open primary

Answer 1

Yep!

Answer 2

primary with proportional*** representation rules is the correct ans.