Multiple choice technology web technology

A question mark following the name of a child name in the declaration of a parent element means

  1. The child element is required.

  2. The name of the child element is unknown.

  3. One occurrence of the child element is required.

  4. The child element is optional
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In DTD element declarations, a question mark (?) following a child element name means that element is optional (zero or one occurrence). For example, means title is optional while author is required.

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