What shell’s wild-card is used to match a single character? A. [!ijk] B. [ijk] C. ? D. * E. None of the above

The correct answer is C. ?.

A wild card is a special character that can be used to represent one or more characters. In the shell, the wild card character ? matches any single character. For example, the command ls *.txt will list all files in the current directory that end in .txt.

The other options are not correct. Option A, [!ijk], matches any character except i,