Which of the following R functions is used to read a CSV file named $"1$st$\_$data.csv$"$ into a data frame?

$(2$ Points$)$

Select one:

a$.$ load$("1$st$\_$data.csv$")$

b$.$ read.csv$("1$st$\_$data.csv$")$

c$.$ read.table$("1$st$\_$data.csv$")$

d$.$ import.csv$("1$st$\_$data.csv$")$