Abner and Abijah are brothers who own a painting business together.

The mean amount of time it takes Abner to paint a medium sized room is $5.59\text{ hours}$ with a standard deviation of $0.63\text{ hours}$.

The mean amount of time it takes Abijah to paint a medium sized room is $6.11\text{ hours}$ with a standard deviation of $0.45\text{ hours}$.

Assuming the amount of time it takes each brother to paint is independent, which of the following is closest to the standard deviation of the difference (Abner - Abijah) in the amount of time it takes for the two brothers to paint a medium sized room?

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