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In the BinaryToBCD block, a constant $0110$ was input to the $4-$bit adder. Why was $0110$ used?

Select one:

a$.0110$ is the output for an XOR gate. An Adder uses at least two XOR gates. Inputting $0110$ to an Adder saves energy sinc one of the outputs of the XOR gate are already generated.

b$.0110$ causes the $4-$bit adder to produce a carry out when an input of $1010$ or higher is received, signaling the multiplexer to output the correct $1\text{'}$s place value and producing a $1$ in the ten's place.

c$.$ Any value greater than $5(0101)$ will work since $10+5=15$ and $15$ is the maximum value a $3-$bit adder can produce when its carry$-$in bit is a logic HIGH. $6(0110)$ just happens to be the first value that works.

d$.$ The lab procedure said to set it to $0110$

Clear my choice