Triangle △ A ′ B ′ C ′ △A ′ B ′ C ′ triangle, A, prime, B, prime, C, prime is the result of reflecting △ A B C △ABCtriangle, A, B, C across the line ℓ ℓell. 1 1 - 1 - 1 - 2 - 2 - 3 - 3 - 4 - 4 - 5 - 5 - 1 - 1 - 2 - 2 - 3 - 3 - 4 - 4 - 5 - 5 - 6 - 6 - 7 - 7 y y x x A A B B C C ℓ ℓ Select all of the correct statements about the unchanged properties of △ A B C △ABCtriangle, A, B, C and △ A ′ B ′ C ′ △A ′ B ′ C ′ triangle, A, prime, B, prime, C, prime