What layer is Cardano?

Could you please clarify which layer you are referring to when you ask about Cardano? Cardano, being a blockchain platform, operates on multiple layers, each with its own specific function. The foundational layer, often referred to as the settlement layer, is where transactions are processed and recorded on the blockchain. However, Cardano also boasts a sophisticated design that incorporates additional layers, such as the computational layer, which allows for smart contract execution. So, when you inquire about Cardano's layer, are you asking about its settlement layer, its computational layer, or perhaps another aspect of its architecture?