If you want the print function on line $2$ in the following code to output on the same line as the print function on line $1,$ without printing a newline, what expression should you place in the blank?

$1$ print$("$Rainbow colors:", "red, orange, yellow, $",\_\_\_\_\_)$

$2$ print$("$green$,$ blue, indigo, violet"$)$

a$.$

newline $=0$

b$.$

eol $=""$

c$.$

terminator $=""$

d$.$

end $=""$