Which of the following is an operating system built exclusively to run on a bastion host device?
a. proprietary os
b. general os
c. reverse proxy
d. appliance firewall

a)Proprietary OS

Explanation: Proprietary operating system is the system that is designed for the certain organizations to serve the purpose of designing,development, concepts production etc activities.

Proprietary operating system is constructed and then sold by the companies itself but no alteration can be done by the user in it.E.g.-Mac OS X.Therefore , the correct answer is option (a).

universal windows platform is an open source api created by microsoft and first introduced in windows 10. the purpose of this platform is to develop universal apps that run on windows 10, windows 10 mobile, xbox one and hololens without the need to be re-written for each. it supports windows app development using c++, c#, vb.net, and xaml. the api is implemented in c++, and supported in c++, vb.net, c#, f# and javascript. designed as an extension to the windows runtime platform first introduced in windows server 2012 and windows 8, uwp allows developers to create apps that will potentially run on multiple types of devices.