Why would a laser printer be considered valuable evidence if it, along with the rest of the devices in the office, was shut off?

a. A printer's RAM is not volatile like that of a computer. Files might still be recoved if they were sent to the printer.
b. The spooler file is stored on flash RAM in the printer.
c. The toner cartridge retains a latent image of the last page printed even after the printer is turned off.
d. The printer wouldn't be considered evidence.

c.