Consider the following linear equations: `a x+b y+c z=0` `b x+c y+a z=0` `c x+a y+b z=0` Match the expression/statements in column I with expression/statements in Column II. Column I, Column II `a+b+c!=0a n da^2+b^2+c^2=a b+b c+c a` , p. the equations represent planes meeting only at a single point `a+b+c=0a n da^2+b^2+c^2!=a b+b c+c a` , q. the equations represent the line `x=y=z` `a+b+c!=0a n da^2+b^2+c^2!=a b+b c+c a` , r. the equations represent identical planes `a+b+c!=0a n da^2+b^2+c^2!=a b+b c+c a` , s. the equations represent the whole of the three dimensional space