In an admission test,there are $15$ multiple-choice questions. Each question has $4$ alternatives. For each question,one or more than one answer can be correct. If a student attempts all $15$ questions and marks the answers randomly,in how many different ways can the student answer the question paper?
- A$(2^4 - 1)^{15}$
- B$15^{15}$
- C$4^{15}$
- D$15^4$
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