solved I’m working on a business question and need an explanation

I’m working on a business question and need an explanation to help me learn.

Question: The first software bug was a moth. Really. Visit the Computer History Museum at www.computerhistory.org to learn how Grace Hopper, a rear admiral in the Navy, made history in the computer field with the first software bug. The rigorous testing that takes place during the development phase for the SDLC encompasses much more than looking for bugs. What are the six types of testing that may be performed in the development phase? What occurs in each test? How are scenarios used in the software testing process? How do software tools faciliate software testing? Is it a paradox to use software to test software?