Q. How do you create a new column total_price in dplyr that is the sum of two existing columns price1 and price2?

• (A) mutate(total_price = sum(price1, price2))
• (B) create_column(total_price = price1 + price2)
• (C) calculate_total(total_price = price1 + price2)
• (D) mutate(total_price = price1 + price2)