Andreas wants to choose a strong password for his computer. Which of the following should he include for his password?

A.
A mixture of uppercase and lowercase letters, symbols and numbers.

B.
An arcane phrase only he can remember.

C.
An incorrect spelling of a word or a phrase.

D.
A mixture of random words that form non-sense.

Explanation:
As a recommended best practice every password should be a mixture of uppercase and lowercase letters, symbols and numbers.
Incorrect Answers:
B: An arcane phrase is vulnerable for brute force attacks.
C: An incorrect spelled word or phrase is vulnerable for brute force attacks.
D: Random words are also vulnerable for brute force attacks.