Can you please help with this operating system question?

Question 17 (0.2 points) OS as a Collection of System Calls - Linux and Windows have around 350 system calls each. From a programmers perspective, an operating system can be defined by its supported system calls. O True O False Save Question 18 (0.2 points) A "shell" in computing is an interface between the user and the operating system. Shells provide a way for users to select and execute other programs: A Shell is a program used to start other programs. The term "shell" usually refers to a Command-Line Interface (CLI), but Graphical User Interface (GUI) based shells are common. The Windows Desktop and Start button comprise a shell. O True False Save Question 19 (0.2 points) Many Unix shells exist to meet different needs and personal preferences O True . False Save Question 20 (0.2 points) An interpreter is a program that reads and executes other programs. O True O False Save