Identify the correct statements about acids and bases: I- They can be strong or weak. II- The pH scale is important to indicate the concentration o...

Identify the correct statements about acids and bases:
I- They can be strong or weak.
II- The pH scale is important to indicate the concentration of protons or hydroxides in a solution.
III- It is not possible to measure the pH of a solution.
IV- The Brønsted-Lowry theory establishes that acids are substances capable of donating protons and bases are substances capable of accepting them.

a) I and II are correct.
b) II and IV are correct.
c) I, II, and IV are correct.
d) Only III is correct.