- 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.
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Answer:
I think you have to restart your device.
Invented by William Oughtred in the 1600s but only used in the mid 1800s
Answer: Non-functional
Explanation:
Non-functional requirement(NFR) are the the requirements that evaluates operation of any particular system.It consist of several factors for judging the system such as security, reliability, quality, utility, maintainability etc.These parameters depicts about how a system will perform the tasks.
Other options are incorrect because function requires are used for depicting about specific and certain function in system. Performance requirements deal with the parameter of operation execution.
Correctness and standard requirement are measure for correcting system and general needs in a system respectively.
I think it might be the USD but I'm not sure.