Determine the intervals on which the following function is concave up or concave down. Identify any inflection points. f left parenthesis x right parenthesisequalsStartRoot 4 x EndRoot ln left parenthesis x right parenthesis Question content area bottom Part 1 Determine the intervals on which the following functions are concave up or concave down. Select the correct choice​ and, if​ necessary, fill in the answer​ box(es) to complete your choice. A. The function is concave up on    enter your response here and concave down on    enter your response here. ​(Simplify your answers. Type your answers in interval notation. Use a comma to separate answers as needed. Use integers or fractions for any numbers in the​ expression.) B. The function is concave down on    enter your response here and the function is never concave up. ​(Simplify your answer. Type your answer in interval notation. Use a comma to separate answers as needed. Use integers or fractions for any numbers in the​ expression.) C. The function is concave up on    enter your response here and the function is never concave down. ​(Simplify your answer. Type your answer in interval notation. Use a comma to separate answers as needed. Use integers or fractions for any numbers in the​ expression.) D. The function is never concave up nor concave down. Part 2 Locate any inflection points of f. Select the correct choice​ and, if​ necessary, fill in the answer box to complete your choice. A. An inflection point occurs at xequals    enter your response here. ​(Type an integer or a simplified fraction. Use a comma to separate answers as​ needed.) B. There are no inflection points for f.