A learner forms حَمْرَاءَانِ from حَمْرَاءُ. Which correction explains the rule?

Dual and Plural of Mamdud and Maqsur Nouns

• Keep hamzah because every final hamzah is original.
• Delete the whole ending and add ونَ.
• Change the feminine hamzah to waw: حَمْرَاوَانِ.
• Change the hamzah to ya: حَمْرَيَانِ.