A Fast Ethernet connection utilizes what pins on an RJ-45 plug?

A customer asks a technician for a device that has the capability to easily connect a laptop to an external monitor, keyboard, mouse, and charge the battery. Which of the following devices should the technician recommend to the customer?

A. Lightning B. KVM switch C. USB 3.0 D. Docking station

Write a program called mysed that applies the sed script given as the first argument against the file given as the second. If the sed succeeds (that is, exit status of zero), replace the original file with the modified one. Thus:

mysed '1,10d' text will use sed to delete the first 10 lines from text, and, if successful, will replace text with the modified file