The left and right focus of hyperbola x216 − Y29 = 1 are F1 and F2 respectively. The length of chord AB passing through point F1 on the left branch is 5, then the perimeter of △ abf2 is () A. 12B. 16C. 21D. 26

The left and right focus of hyperbola x216 − Y29 = 1 are F1 and F2 respectively. The length of chord AB passing through point F1 on the left branch is 5, then the perimeter of △ abf2 is () A. 12B. 16C. 21D. 26

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