If I want to save a plot to a PDF file, which of the following is a correct way of doing that?

If I want to save a plot to a PDF file, which of the following is a correct way of doing that?

  • Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()
  • Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf().
  • Open the screen device with quartz(), construct the plot, and then close the device with dev.off().
  • Open the PostScript device with postscript(), construct the plot, then close the device with dev.off().

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