Which of the following sort a dataframe by the order of the elements in B?(a) x[rev(order(x$B)),](b) x[ordersort(x$B),](c) x[order(x$B),](d) x[rev(x$B),]The question was posed to me in a job interview.Question is from Commands topic in section Commands, Packages, Visualizing Data and Linear Regression of R Programming

Which of the following sort a dataframe by the order of the elements i

1.	Which of the following sort a dataframe by the order of the elements in B?(a) x[rev(order(x$B)),](b) x[ordersort(x$B),](c) x[order(x$B),](d) x[rev(x$B),]The question was posed to me in a job interview.Question is from Commands topic in section Commands, Packages, Visualizing Data and Linear Regression of R Programming
Answer» Correct OPTION is (a) x[rev(order(x$B)),] To ELABORATE: x[rev(order(x$B)),] SORT the dataframe in REVERSE order.

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