Which statement about signal phrases is true?

Signal phrases should be worded the same way throughout an informational text.
Signal phrases are only needed when a writer uses a direct quote from an article.
Signal phrases should provide just enough information to show the reader that the source is a valid one that can be trusted.
Signal phrases should provide name, job, and source of every fact used in a text.

Question

Which statement about signal phrases is true?

 Signal phrases should be worded the same way throughout an informational text.
 Signal phrases are only needed when a writer uses a direct quote from an article.
 Signal phrases should provide just enough information to show the reader that the source is a valid one that can be trusted.
 Signal phrases should provide name, job, and source of every fact used in a text.

anonymous · Answer

Hmm, I think I'd say C. I found this: 	
Signal Phrase:  a phrase, clause, or even sentence which leads into a quotation or statistic.  These generally include the speaker/author’s name and some justification for using him or her as an expert in this context; it may also help establish the context for the quotation.