When converting analog waves to a series of numerical values, the higher the sampling rate, the more accurately the original wave can be re-created

Case-based Critical Thinking QuestionsCase 12-2Rosalind wants to add attribute declarations to her DTD, and she turns to you for information about the possible attribute types. Finally, you help Rosalind write the declaration of an attribute named "credits" of an element named "course." This optional attribute should contain character data, and a value of 4 should be used if an attribute value is not specified. Which of the following is an appropriate declaration of this attribute?

A. B. C. D.

The ____________________ DTD is used for documents containing frames.

Fill in the blank(s) with the appropriate word(s).