Rosalind Wants to Add Attribute Declarations to Her DTD, and She

Multiple Choice

Rosalind 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) <!ATTLIST credits course CDATA default="4">
B) <!ATTLIST course credits CDATA default="4">
C) <!ATTLIST credits course CDATA "4">
D) <!ATTLIST course credits CDATA "4">