Which of the following statements are correct?1. Accuracy is the closeness with which an instrument approaches the true value of the quantity being measured.2. Precision is a measure of the reproducibility of the measurement.3. Precision of an instrument can be improved upon by calibration.4. Accuracy may be specified in terms of limits of errors.

• A. 1, 2 and 3 only
• B. 1, 3 and 4 only
• C. 1, 2 and 4 only
• D. 2, 3 and 4 only