What will the following code print:

colours$<-$ list$("$red$",$ "blue", "green"$)$

for$($x in colours$)\{$ if$($x $==$ "blue"$)\{$ next $\}$ print$($x$)\}$

a$.$

red, blue, green

b$.$

red, green

c$.$

blue

d$.$

red, blue