A company wants to launch a product. Before the product launch, they want an analysis of data taken through a customer survey. You are a data analyst and they have provided the data in the form of a CSV file named "company$\_$data" to you so that you can provide some insights into the data recorded through the survey. You are using Python to analyze the data. Answer the following questions based on the information provided above.

How can you check the column names of the dataframe?

a$.$

Data$1.$columns

b$.$

list$($columns$)$

c$.$

list$($Data$1.$columns$)$

d$.$

list$($Data$1)$