Read the statements given below with regard to the function performed by the Golgi apparatus.
I. Transport and chemically modified the material contained within it .
II. Secrete mucin in the respiratory tract.
III. Secrete mucin in the respiratory tract.
Which of the following is the CORRECT answer ?

Options

A. I is wrong but II and III are correct
B. II is wrong but I and III are correct
C. II and III are wrong but I is correct
D. I, II and III are correct

Answer

To solve the question regarding the functions performed by the Golgi apparatus, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding the Golgi Apparatus**:
- The Golgi apparatus is a cell organelle involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.

2. **Analyzing Statement I**:
- **Statement I**: "Transport and chemically modify the material contained within it."
- The Golgi apparatus does indeed transport materials (like proteins and lipids) from the endoplasmic reticulum and chemically modifies them (e.g., glycosylation).
- **Conclusion**: This statement is **correct**.

3. **Analyzing Statement II**:
- **Statement II**: "Secrete mucin in the respiratory tract."
- Mucin is a glycoprotein secreted by epithelial cells in the respiratory tract. The Golgi apparatus plays a role in the processing and secretion of mucin from these cells.
- **Conclusion**: This statement is **correct**.

4. **Analyzing Statement III**:
- **Statement III**: "Secrete mucin in the respiratory tract."
- This statement is identical to Statement II. Since it is the same statement, it also holds true that the Golgi apparatus is involved in the secretion of mucin.
- **Conclusion**: This statement is also **correct**.

5. **Final Evaluation**:
- Since all three statements (I, II, and III) are correct, the correct answer is that all statements are true.

### Final Answer:
- The correct answer is that **all statements (I, II, and III) are correct**.