Consider the following VHDL code and identify the syntax

error$($s$)$ within it:

library IEEE;

entity error$\_$example$\_$entity is

Port $($ SEL : in BIT$\_$VECTOR$(2$ downto $0)$;

IN$\_$A : in BIT$\_$VECTOR$(3$ downto $0)$;

IN$\_$B : in BIT$\_$VECTOR$(3$ downto $0)$;

OUTPUT : out BIT$\_$VECTOR $(7$ downto $0))$;

end error$\_$example$\_$entity;

architecture Behavioral of error$\_$example$\_$entity is

begin

with SEL select

IN A & $\text{'}0\text{'}$ & IN B when others;

end Behavioral;

Select one:

$$ a$.$ The concatenation operation $\text{'}$O$\text{'}$ & IN$\_$A &

IN$\_$B generates a BIT$\_$VECTOR of incorrect size

for OUTPUT.

$$

b$.$ The selected signal assignment syntax is

incorrect for VHDL$.$

c$.$ The literal $\text{'}$O$\text{'}$ is of type BIT, which cannot

be concatenated with BIT$\_$VECTOR types

without explicit conversion.

$$ d$.$ The SEL signal's range is too large for the

provided selection cases.