Which of the following assumptions do we make while deriving linear regression parameters?1. The true relationship between dependent y and predictor x is linear2. The model errors are statistically independent3. The errors are normally distributed with a 0 mean and constant standard deviation4. The predictor x is non-stochastic and is measured error-free

• A. a. 1,2 and 3.
• B. b. 1,3 and 4.
• C. c. 1 and 3.
• D. d. all of above.