Answer:
D. Operating system
Explanation:
A keyboard is a secondary item like a mouse and is not apart of computer hardware and app is also not a computer hardware because its coding not hardware. Web Browser is a Internet thing not hardware.
- The subnet mask would be a 32-bit integer which is formed by assigning the host bits to all 0's and the networking bits to so many 1's.
- In this method, the subnetting separates the IP address between host and network addresses.
- The subnet mask covers an IP address with its 32-bit number, thus the term "mask".
Given:
Network IP address
Subnet numbers
Calculating the borrow bits:

a)
Calculating the dotted decimal value for the subnet mask:

b)
The additional bits which will be needed to mask the subnet mask that is = 4.
Learn more: brainly.com/question/2254014
In most languages. Primitive data types ( char, int, float, bool, maybe string ) are usually passed by value, but compound data types are passed by reference, so you're not working on a copy but on the original.