Observer \(\mathrm{O}\) at the origin of a coordinate system is at rest relative to two equidistant space stations located at \(x=+3.00 \times 10^{6} \mathrm{~km}\left(\right.\) station A) and \(x=-3.00 \times 10^{6} \mathrm{~km}\) (station B) on the \(x\) axis. In reference frame \(\mathrm{O}\), station A sends out a light pulse at \(t=0\) (event 1) and station B also sends out a light pulse at \(t=0\) (event 2). Observer \(\mathrm{C}\) moves relative to \(\mathrm{O}\) with velocity \(0.600 c_{0}\) in the positive \(x\) direction, and observer \(\mathrm{D}\) moves relative to \(\mathrm{O}\) with velocity \(0.600 c_{0}\) in the negative \(x\) direction. What are the displacement from event 1 to event 2 , and the time interval between events 1 and 2 , according to 

(a) observer \(\mathrm{C}\) and

(b) observer D?