What is the output of the following piece of code? def a(n): if n == 0: return 0 elif n == 1: return 1 else: return a(n-1)+a(n-2) for i in range(0,4): print(a(i),end=" ")

• A. 0 1 2 3
• B. An exception is thrown
• C. 0 1 1 2 3
• D. 0 1 1 2