What is the golden rule saving rate? Is it different than the saving rate which maximizes present consumption?

a. The golden rule saving rate is the rate at which savings equal investment; it is the same as the saving rate that maximizes present consumption.
b. The golden rule saving rate is the rate at which savings equal investment; it is different from the saving rate that maximizes present consumption.
c. The golden rule saving rate is the rate at which investment equals present consumption; it is the same as the saving rate that maximizes present consumption.
d. The golden rule saving rate is the rate at which investment equals present consumption; it is different from the saving rate that maximizes present consumption.