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Which pair gives the instrument plurals shown in this Bab?

Trilateral Bare Regular - Bab 4: Fataha Yaftahu & Guttural Letters Rule

• مَفَاتِحُ / مَفَاتِيْحُ
• فُتَحٌ / فُتْحَيَاتٌ
• أَفَاتِحُ / أَفْتَحُوْنَ
• مَفْتَحٌ / مِفْتَحٌ