If you were working on a mainframe, which of the following operating systems would you most likely be using?

If I am working on a mainframe I shall choose z/OS.This Operating System are specially design for Mainframe by IBM. It is widely used mainframe operating system, is designed to offer a stable, secure and continuously available environment for application running on the mainframe. as control program, z/Virtual Machine (z/VM) is a hyper-visor because it runs other operating system in the Virtual machines it creates.

In Linux, Unix operating system z/OS component must be included.

z/Os is a 64-bit operating system for IBM mainframes. It derives from and is the successor to OS/390.Which in turn followed string of MVS versions.

a variable of array type holds a reference of object

array are commonly used in computer program to organize data so that a related set of values

array are using zero base indexing it start with 0.

all component of array have same type, two different types doesn't use in single array

if array are store 10 quantities its index value varies from 0 to 9.

it stores 1st quantity value in index value 0 and this process will same till index value 9.