Yellow light shines on a single slit. The resulting pattern seen on a screen behind the slit

consists of three yellow spots, one at zero degrees $($straight through$)$ and one each at $5.$

You now add red light of equal intensity, shining on the single slit. The new pattern consists

of

a$)$ orange spots at $0$ and $5.$

b$)$ yellow spots only, at $0$ and $5.$

c$)$ an orange spot at $0,$ yellow spots at $5,$ and red spots slightly farther out.

d$)$ an orange spot at $0,$ yellow spots at $5,$ and red spots slightly closer in$.$

e$)$ a white spot at $0,$ and a complicated pattern of orange and red spots between $0$ and $5$