The answer is D, I believe.
Answer:
They manage making websit/es beautiful. Basically how brainly is setup? The layout is nice? Front end developers are responsible for why webpages look pretty or nicely done. <em>fun fact, my dream job is a front end developer!</em>
Firewalls are connected with a network device which blocks untrusted network forming a barrier in between trusted and un-trusted network.
Answer: Operating system
Explanation:
The operating system is the type of software that are responsible for manage the processor time and also the memory allocation in the system. The operating system mainly deals with the processor time by scheduling the processor work done in the system.
The OS mainly control the system and then schedule the execution of various types of function by the central processing system (CPU). It also control the memory allocation in the system.