What Are the Key Differences Between Market Penetration and Product

What are the key differences between market penetration and product development?

A) Market penetration focuses on current products to existing markets,while product development focuses on new products to existing markets.
B) Market penetration focuses on current products to new markets,while product development focuses on new products to existing markets.
C) Market penetration focuses on new products to existing markets,while product development focuses on new products to new markets.
D) Market penetration focuses on new products to new markets,while product development focuses on new products to existing markets.
E) Market penetration focuses on market development,while product development focuses on diversification.