Which of the following is/are the chief Characteristics of commercial grain farming of the middle latitude grasslands?1. The size of farms are generally large.2. Cultivation is highly mechanized.3. It is a type of extensive farming.Select the correct answer using the code given below?

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