Which of the following is Potash Alum?
- A$K_{2}SO_{4} \cdot Al_{2}(SO_{4})_{3} \cdot 24H_{2}O$
- B$K_{2}SO_{4} \cdot Cr_{2}(SO_{4})_{3} \cdot 24H_{2}O$
- C$K_{2}SO_{4} \cdot Fe_{2}(SO_{4})_{3} \cdot 24H_{2}O$
- D$(NH_{4})_{2}SO_{4} \cdot FeSO_{4} \cdot 6H_{2}O$
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