Suppose your are responsible or increasing the tracking accuracyof a radar system. You presently have a radar that has a measurement variance of 10. For equal cost you could either:(a) optimally combine the present radar system with a new radar system that has a measurement variance of 6; or, (b) optimally combine the present radar system with two new radar systems that both have the same perormance as the original system. Which would you propose to do? why?