The scatter plot shows the relationship between the average number of nightly customers and the number of months since a restaurant opened. The equation represents the linear model for this data. y = 5x + 120

What does the number 120 in the equation mean in this context?

The number of customers per night increases by 120 each month.

There were 120 customers per night when the restaurant opened.

There were 120 customers per month after the restaurant was open 5 months.

The restaurant has been open for 120 months.

For every 5 months the restaurant has been open, there are 120 more customers per night.