Evaluate the following statements regarding Software Development Kits (SDKs) in the context of mobile app development and growth strategies.
Identify which statements are correct:
- Statement I: SDKs allow for the integration of external services like analytics and advertising within an app without the need for extensive custom coding.
- Statement II: A common use of SDKs in mobile apps is to facilitate the connection to physical hardware components like sensors or cameras.
- Statement III: Attribution SDKs are used to track user acquisition sources and measure the effectiveness of marketing campaigns within mobile apps.
Choose the correct combination of statements.