Answer:
hardware and software is the answer
At the: Firewall, the DMZ is configured in the Organization. Within the firewalls, it is accessible. They have been completed with the intention of adding an additional layer of safety to the organization to protect it.
The DMZ safeguards not only the web server but also the remainder of the network. To allow visitors to the network to access the web server, a security breach must be made.
The DMZ lessens the possible risk caused by this gap. A secure network, protected by the FortiGate, that only permits access if it has been specifically authorized is known as a DMZ network (from the term "demilitarized zone").
In this illustration, a private subnet is used by the DMZ network, which permits access to a web server by internal and external users using distinct addresses while blocking access from the web server to the internal network in the case that the web server is compromised.
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I believe its A as the image provided says plain message
Answer:
200 nm
Explanation:
We need a constructive interference to see the bright reflection
we know that 
where m=1 and 
is the wavelength of the gasoline
so 
putting the value of m and in thickness equation
so the thickness of the film will be 200 nm
