Which of the following function calls can be used to invoke the below function definition? (Choose three.) def test(a, b, c, d):

Question

Options

• Atest(a=1, b=2, c=3, 4)
• Btest(1, 2, 3, d=4)
• Ctest(a=1, 2, 3, 4)
• Dtest(1, 2, 3, 4)
• Etest(a=1, b=2, c=3, d=4)
• Ftest(a=1, 2, c=3, d=4)

• A
  13% (3)
• B
  79% (19)
• C
  4% (1)
• F
  4% (1)

Explanation

B, D, and E are correct because Python allows function arguments to be passed entirely by position (D), entirely by keyword (E), or as a mix where positional arguments come first and keyword arguments follow (B). In B, 1, 2, 3 fill a, b, c positionally, then d=4 is specified by name - a perfectly valid hybrid.

A, C, and F are all wrong for the same core reason: Python's syntax rule states that positional arguments cannot follow keyword arguments. In A, 4 is a bare positional that comes after a=1, b=2, c=3. In C, 2, 3, 4 are positional but appear after a=1. In F, the positional 2 appears between keyword arguments a=1 and c=3. All three raise a SyntaxError: positional argument follows keyword argument.

Memory tip: Think of it as a one-way door - once you switch to keyword arguments in a call, you must stay with keywords for the rest of the call. "Keywords can trail positions, but positions can't trail keywords."

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