Python Counter Quiz: Signed Counts and Multiset Operations

Python Counter Quiz: Signed Counts and Multiset Operations

Choose one answer. Each attempt draws 10 of 20 questions; the practice pass mark is 8/10. Original topic practice, not an official exam. Python 3.12 Counter arithmetic, subtract, zero counts and multiset boundaries.
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What is printed?
python
from collections import Counter
print(Counter('cabca').most_common(1))