What does entering "?" do with an input file?

Entering "?" in an input file is used as a wildcard character that represents any single character. When you use "?", it allows for flexibility in matching filenames or data that start with a specified set of characters, followed by any single character. For instance, if you have a file search pattern like "test?", it would match "test1", "testA", or "test_," but would not match "test" (which has no character after it) or "tests" (which has more than one character). This functionality enhances the ability to locate files or data entries that fit a certain naming schema while still accounting for slight variations in their characters.

The other choices don't accurately reflect the specific function of the "?" wildcard. Omitting files, limiting searches to a single character, or broadly expanding search capabilities are not the direct results of using this wildcard in the context of input files.