Answer: B. Personal Idea
Explanation:
Issac Newton's Law of Gravity was made by the one and only, Issac Newton.
He used his time to investigate and discover this law, so choice one, cheating is not correct. Choice three is also incorrect, because the world didn't know about this law, or so much about gravity during that time.
Thus, choice two is correct because it was created and written through his ideas.
So therefore, the answer is choice two, personal idea.
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Answer:
Git is a collaborative software used by members of a group to share and work on the same projects. Github is a web application that uses git to link people working together on a codebase. With git and Github, opensource projects can be accessed and collaborated on by volunteers.
Explanation:
Opensource development is a collaborative group of developers working together on a software or platform with a general public license. When working on an opensource project, each developer is able to folk or get a copy of the repository downloaded to a local computer which they can work on and push or update to the actual online repository if the condition for a change is met.
Answer: Strong 128-bit encryption.
Explanation: An individual character corresponds to 8 bits . So if there are 16 characters then,
16
8=128 bits keys
This makes the 128 bit key encryption the strongest amongst all other options.It is strongest because it is almost impossible to decode the 128-character key by any method e.g.-brute-force method.
Other options are incorrect because the characters given by the other bits are as follows: 
=32 characters
=64 characters
=128 characters
Thus, the strongest character key is of 128 bits. for cipher.
