A. The claim of an application for a patent for invention determines the scope of patent protection.
B. Pictures or photographs of an application for a patent for utility model or design are used to determine the scope of patent protection.
The description of an application for a patent for invention plays an explanatory role in patent authorization, confirmation and right protection.
D. As a part of the specification, the attached drawings also play an important explanatory role in some cases.
Correct answer: b