What is the output of the following piece of code? >>>import collections >>> a=collections.Counter([1,1,2,3,3,4,4,4]) >>> a

• A. {1,2,3,4}
• B. Counter({4, 1, 3, 2})
• C. Counter({4: 3, 1: 2, 3: 2, 2: 1})
• D. {4: 3, 1: 2, 3: 2, 2: 1}