Final answer:
In-text citations are found immediately after the quoted or paraphrased material, enclosed in parentheses, and are brief. They don't contain complete source information, which is found in the Works Cited list.
Step-by-step explanation:
Characteristics of in-text citations include being placed immediately after the information or quotation to be documented, which answers letter 'b'. They are typically enclosed in parentheses, aligning with letter 'c'. Furthermore, in-text citations should be very brief, so letter 'd' is also correct. These citations provide a way for readers to find the original source on the Works Cited page. However, it's important to note that they do not contain complete information about a source nor do they give all of the exact information as the Works Cited list, which means letters 'e' and 'f' are not characteristics of in-text citations.