问题：
[单选题]在R程序中,用于打开数据库suhuaipigs.csv正确的程序为()
A> mydata <- readtable("suhuaipigs.csv", header = TRUE, sep=" ")
B> mydata <- readtable("suhuaipigs.csv", header = TRUE, sep=",")
C> mydata <- read.table("suhuaipigs.csv", header = TRUE, sep=" ")
D> mydata <- read.table("suhuaipigs.csv", header = TRUE, sep=",")
