The equation ax^(2)+2hxy+by^(2)+2gx+2fy+...

The equation `ax^(2)+2hxy+by^(2)+2gx+2fy+c=0` represents a pair of parallel straight lines if

A

`a=b=0 and c=0`

B

`f=g and h=0`

C

`a=bne0 and h=0`

D

`f=g and c=0`

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