According to Euclid's division lemma,for given positive integers $a$ and $7$,there exist unique non-negative integers $q$ and $r$ such that $a = 7q + r$; where..........
- A$0 < r \leqslant 7$
- B$0 \leqslant r < 7$
- C$1 \leqslant r \leqslant 7$
- D$r \geqslant 7$
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