A(n) ________ is identified by its column letter and row number

If a technician does not assign an IP address to a device, the DHCP server will assign the device

A. static IP address. B. reservation. C. dynamic IP address. D. MAC address.

Assigning a subclass reference to a superclass variable is safe ________.

a. because the subclass object has an object of its superclass. b. because the subclass object is an object of its superclass. c. only when the superclass is abstract. d. only when the superclass is concrete.