Step 1: Understanding the Concept
Derived proteins are obtained by partial hydrolysis of simple or conjugated proteins, so they are not found in nature.
Step 2: Check statements
Statement II is correct because derived proteins are made by hydrolysis and do not occur naturally.
Statement I is taken as correct because most blood proteins are acidic proteins.
Step 3: Match
Both statements are correct, option (A).
Final Answer:
Both statements are correct.
\[ \boxed{\text{(A) }\text{Both statement I and statement II are correct.}} \]