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___________ remove all the variables from the workspace. (a) rm(x) (b) rm(list=ls()) (c) ls() (d) attach(mat) I had been asked this question in an internship interview. Query is from Commands in section Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

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Right choice is (b) rm(list=ls()) To explain: attach(mat) make the names of the variables in the matrix or data frame available in the workspace.

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