If the angle subtended by a chord at the centre of a circle is $90^\circ$, and the radius of the circle is $7\text{ cm}$, what is the length of the chord?
Options:
- A: $7\sqrt{2}\text{ cm}$
- B: $14\text{ cm}$
- C: $7\text{ cm}$
- D: $3.5\sqrt{2}\text{ cm}$
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