A recent study revealed that 60% of American drivers used their seatbelts. A sample of 20 drivers on a Florida freeway was selected. Let X be the number of driversin the sample wearing a seatbelt.

1. X is not a binomialvariable because the outcomes are not independent
2. X is not a binomial variable because the probability does not remain constant
3. X is a binomial variable because all four binomial properties are satisfied.
4. X is not a binomial variable because some of the binomial properties are not satisfied.

Which options should I choose?