1 Peter 2:9 calls believers a chosen people, a holy nation, and a royal what?

Answer: Priesthood

"You are a chosen people, a royal priesthood, a holy nation," called out of darkness into His marvelous light.

“But you are a chosen people, a royal priesthood, a holy nation, a people for God’s own possession, to proclaim the virtues of Him who called you out of darkness into His marvelous light.”— 1 Peter 2:9 (BSB)