The correct answer is: A. lpd
lpd is a command-line utility that is used to add printing jobs to the queue. It is a part of the CUPS printing system.
To add a printing job to the queue, use the lpd command with the -P option to specify the printer name. For example, to add a job to the queue for the printer named “myprinter”, you would use the following command:
lpd -P myprinter
The lpd command can also be used to control the printing process. For example, you can use the -o option to specify options for the printer, such as the number of copies to print. You can also use the -t option to specify the type of job to print. For example, to print a text file named “myfile.txt”, you would use the following command:
lpd -o copies=2 -t text myfile.txt
The lpd command is a powerful tool that can be used to manage printing jobs. It is a part of the CUPS printing system, which is a widely used printing system.
The other options are:
B. lpr: This command is used to print a file. It is not used to add printing jobs to the queue.
C. lpq: This command is used to list the printing jobs in the queue. It is not used to add printing jobs to the queue.
D. lpc: This command is used to control the printer. It is not used to add printing jobs to the queue.
E. None of the above: This is not a valid option.