which items need to be corrected before this file will pass a validation check?

In this screenshot,

which items need to be corrected before this file will pass a validation check? Note: There are 2 correct answers to this question.
A . The max-length attribute on line 10 needs to be removed.
B. The DTD reference on line 4 needs to be changed.
C. The standard element id on line 7 needs to be corrected.
D. The DOCTYPE tag on lines 2-4 needs to be on a single line.

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Answer: A,B