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Which of the following are examples of ...

Which of the following are examples of null set?
(i) `A ={"x:x is root of equation x + 3 =0 and "x in N} `
(ii) `B ={x:x in Z,9x -8=0}`
C={x:x is letter of the word MAKE}

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(i) `A={x:x in N and x ge 5}`
(ii) `A={x:x in N and x ge 5}`
(iii) `A={x:x in N and 9 le x le 12}`
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