Which of the following statements pertaining to indifference curve is true?

A. The slope of the indifference curve represents the marginal rate of substitution between two goods

B. Indifference curve in case of perfect substitutes is a straight line with positive slope

C. Two indifference curves intersect with each other in case of perfectly complementary goods

D. Indifference curves intersect with each other at their mid point

E. In case of perfect substitutes, the indifference curves are linear

Choose the correct answer from the options given below: