The relationship between the type of diversification and overall firm performance

a. takes on the shape of an inverted U so related diversification has the best performance.
b. takes on the shape of a U where modest diversification has the worst performance.
c. is positive, meaning that more diversification always leads to higher firm performance.
d. is negative, meaning that more diversification always leads to lower firm performance.
e. there is no relationship between the type of diversification and overall firm performance.