Airquality Data is a data set in base R$.$

In this problem, you will examine the airquality data, which contains the daily air quality measurements in New York from May to September $1973.$

Type data$($airquality$)$ to load the data to your R$\text{'}$s work space. You can type View$($airquality$)$ to take a look at the data.

a$.$ Type class$($airquality$)$ to find out the class of the object airquality.

airquality is

Airquality Data is a data set in base R$.$

In this problem, you will examine the airquality data, which contains the daily air quality measurements in New York from May to September $1973.$

Type data$($airquality$)$ to load the data to your R$\text{'}$s work space. You can type View$($airquality$)$ to take a look at the data.

a$.$ Type class$($airquality$)$ to find out the class of the object airquality.

airquality is

a matrix.

a numeric vector.

an integer vector.

a data frame.