If \( 2 x-3 y=7 \) and \( (a+b) x-(a+b-3) y=4 a+b \) have an infini...

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If \( 2 x-3 y=7 \) and \( (a+b) x-(a+b-3) y=4 a+b \) have an infinite number of solutions then
D.
(a) \( a=5, b=1 \)
(b) \( a=-5, b=1 \)
(c) \( a=5, b=-1 \)
(d) \( a=-5, b=-1 \)
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