Josh is learning about hackers know for finding loopholes in systems, without notifying the company or organization beforehand. Which type of hacker is he learning about ?

Grey Hat Hacker

Explanation:

Mainly there are 3 types of hackers:

1: Black Hat Hacker: Hackers who enter in our device without permission and steal our important files and blackmail us or put virus in our device without permission. Black Hat hackers are criminals.

2: Grey Hat Hacker: Hackers who enter in our device without permission but, for checking that our device is safe or not and tell us about virus(if there). They did not harm our device or put virus or take our important documents. They are not criminals

3: White Hat hacker: Hackers who enter in our device with our permission only, and tell us about virus that there is any virus in our device or not and also tell us that our device is safe or not. They are also not criminals.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.