Proof WritingMediumDirect Proof ShareDirect Proof · Medium problemFor integers a,ba, ba,b and d>1d > 1d>1, which inference is always valid?AIf d∣ad \mid ad∣a and d∣a+bd \mid a + bd∣a+b, then d∣bd \mid bd∣bBIf d∣a+bd \mid a + bd∣a+b, then d∣ad \mid ad∣aCIf d∣abd \mid abd∣ab, then d∣ad \mid ad∣a or d∣bd \mid bd∣bDIf d∣a2d \mid a^2d∣a2, then d∣ad \mid ad∣aCheck Show answer Walk through it step by step Practice more like this Review this concept