Select an appropriated replication in an experiment consisting of the measurement of the quantity of vehicles stopped in a corner where the Day of the week (1-7) and the Moment in the day (morning-afternoon-night) are the factors to consider

a. A simplest combination of morning and night is prepared and run

b. All runs using the level "morning" are measured again

c. A selected run is complete done once again except in weekends

d. None of above