The following system of linear equations
`7x+6y-2z=0`
`3x+4y-2z=0`
`x-2y-6z=0`, has

Options

A. infinity many solutions,`(x,y,z)` satisfying `x=2z`
B. no solutiuon
C. only the trivial solution
D. infinitely many solutions, `(x,y,z)` satisfying `y=2z`