List a is defined as follows: a = ['a', 'b', 'c'] Which of the following statements adds 'd&#

题目：List a is defined as follows: a = ['a', 'b', 'c'] Which of the following statements adds 'd' and 'e' to the end of a, so that it then equals ['a', 'b', 'c', 'd', 'e']:

A. a.extend(['d', 'e'])

B. a += ['d', 'e']

C. a[len(a):] = ['d', 'e']

D. a += 'de'

E. a.append(['d', 'e'])

F. a[-1:] = ['d', 'e']

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