?Which of the following is true of thedefaultattribute when adding text tracks to a video file?
A. ?It enables all the available tracks by marking them asdefault.
B. ?It enables the active track by marking it with thedefaultattribute.
C. ?Thedefaultattribute is not required when there is a single track available.
D. ?Thedefaultattribute is not required when there are multiple tracks available.
Answer: B
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a. #include (string class)
b. #include namespace std;
c. #include
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