One problem with digital data is that it can be vulnerable to hackers. What is a hacker?
A. A program that changes analog data into stored digital data
B. A person who gains unauthorized access to digital data
C. A program that protects stored digital data from computer viruses
D. A person who modifies stored digital data so that it is copied
perfectly

Could someone me find the answer to this problem.

Which of these metals are magnetic?

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.