Factorise the following using appropriate identities: $x^{2} - \frac{y^{2}}{100}$
- A$(x + \frac{y}{10})(x - \frac{y}{10})$
- B$(x + \frac{y}{50})(x - \frac{y}{50})$
- C$(x + \frac{y}{100})(x - \frac{y}{100})$
- D$(x + \frac{y}{20})(x - \frac{y}{20})$
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