A line is drawn through the point (1,2) to meet the coordinate axes atand Q such that it forms a ...

A line is drawn through the point (1,2) to meet the coordinate axes atand Q such that it forms a triangle OPQ, where O is the origin. If the area of the triangle OPQ is least, then the slope of the line PQ is :
(W)
(1) -1/2
(2) -1/4
(3) -4
(4) -2

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