Example 1:
- Option A: A question mark is used only at the end of a sentence.
- Option B: The question mark is used only at the end of a sentence.
Example 2:
- Option A: A ? character is used only at the end of a sentence.
- Option B: The ? character is used only at the end of a sentence.
Which sentences are correct, A or B? It seems that in most cases people use the indefinite article in such sentences, but from my point of view "?" exists in a single instance; we just refer to this instance here and there.