Let \( \mathrm{R} \) be set of points inside a rectangle of \( \operatorname{sides~} a \) and \( b(a, b>1) \) with two sides along the positive direction of \( x \)-axis and \( y \)-axis. Then
(A) \( \mathrm{R}=\{(x, y): 0 \leq x \leq a, 0 \leq y \leq b\} \)
(B)math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=normalR/mimo=/momo{/momo(/momix/mimo,/momiy/mimo)/momo:/momn0/mnmo≤/momix/mimo</momia/mimo,/momn0/mnmo≤/momiy/mimo≤/momib/mimo}/mo/math
(C) math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=normalR/mimo=/momo{/momo(/momix/mimo,/momiy/mimo)/momo:/momn0/mnmo≤/momix/mimo≤/momia/mimo,/momn0/mnmo</momiy/mimo</momib/mimo}/mo/math
(D) math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=normalR/mimo=/momo{/momo(/momix/mimo,/momiy/mimo)/momo:/momn0/mnmo</momix/mimo</momia/mimo,/momn0/mnmo</momiy/mimo</momib/mimo}/mo/math
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