Eli makes custom$-$made leather handbags and wallets in a small shop. He is known for his fine leather products and hand stitching, as well as the lifetime warranty he offers on his products. His items are expensive, and he has no desire to increase the size of his shop. What has Eli developed within his shop?

a$.$ Distinctive competence

b$.$ Cost leadership strategy

c$.$ Product life cycle

d$.$ Organizational opportunities

e$.$ Threats to the environment