Questions: A string containing no characters is called a(n) string. a. missing b. zero c. empty d. non

The answer is the third one (c): empty.

Explanation for each option: a. Missing: This term is not typically used to describe a string with no characters. It might imply that something is absent, but it is not the correct term for a string with no characters. b. Zero: While "zero" might imply the absence of something, it is not the standard term used to describe a string with no characters. c. Empty: This is the correct term. An "empty" string is a string that contains no characters. It is often represented as "" (two double quotes with nothing in between). d. Non: This term does not relate to the concept of a string with no characters and is not used in this context.

Summary: A string containing no characters is called an "empty" string.