Operating System (OS)
GUI means

Geographic user interface
Geometric user interface
Graphical user interface
Graphic user interface

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
Addressing structure

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
All of these

ANSWER DOWNLOAD EXAMIANS APP