How many columns are used for grid system by bootstrap?
A. 14
B. 11
C. 16
D. 12
Answer: Option D
A. 14
B. 11
C. 16
D. 12
Answer: Option D
Which of the following specifies the main content of the document?
A. <time>
B. <main>
C. <details>
D. <section>
A. 100%
B. contain
C. cover
D. 100%100%
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