Question $13(5$ points$)$

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Which declaration is correct?

a$)$ enum colors $($green$,$ red, yellow, blue$)$;

b$)$ enum colors $\{$green$,$ red, yellow, blue$\}$;

c$)$ enum colors $\{"$green$",$ "red", "yellow", "blue"$\}$;

d$)$ enum colors $\{$green$,$ red, yellow, blue$\}$ shade;

e$)$ both $b$&$d$

f$)$ both b and c