An effective summary should begin with a sentence that contains the author's name, the title of the text, and (5 points)

the length of the original text

the author's birth date

the date of publication

the main idea of the entire text

The answer is 'the main idea of the entire text' because that's what a summary is, it's a main idea of a text, so that someone who might want to read the text, can get a good idea of what the text is going to be about.

Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)