Load the built-in dataset ChickWeight using:

ChickWeight

Do this in RStudio so you can look at the contents of the ChickWeight dataframe

Which of the following is true:

1. ChickWeight is not tidy: each chick has more than one row.
2. ChickWeight is tidy: each observation (a weight) is represented by one row. The chick from which this measurement came is one of the variables.
3. ChickWeight is not tidy: we are missing the year column.
4. ChickWeight is tidy: it is stored in a data frame.

Write the number of the correct answer