The bisectors of the angles \( B \) and \( \mathrm{C} \) of a \( \triangle \mathrm{ABC} \), meet...

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The bisectors of the angles \( B \) and \( \mathrm{C} \) of a \( \triangle \mathrm{ABC} \), meet the opposite sides in \( \mathrm{D} \) and \( \mathrm{E} \) respectively and \( \mathrm{DE} \) is parallel to \( \mathrm{BC} \). Then the triangle is
a. Right-angled
b. Equilateral
c. Isosceles
d. Scalene
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