**All of these**

A CV, or curriculum vitae, is a document that provides a summary of a person's education, work experience, skills, and other relevant information related to their professional background. It is typically used when applying for a job or seeking academic opportunities.

In the given options, all of them can be examples of a CV:

**a) Self-driving cars:**
Even though self-driving cars may not seem like a traditional CV, they can indeed have a CV in the form of software or algorithms. Self-driving cars rely on complex computer programs and machine learning algorithms to analyze data, make decisions, and operate autonomously. These programs and algorithms can be seen as the "CV" of a self-driving car, as they contain information about the car's capabilities, training, and experiences that enable it to navigate the roads safely.

**b) Smart Interactions:**
Smart interactions refer to the technology and systems that allow devices to interact with humans in an intelligent and intuitive manner. This can include voice assistants like Siri or Alexa, chatbots, and other forms of artificial intelligence. In the case of smart interactions, the "CV" would be the underlying algorithms and data that enable the system to understand and respond to human input. These algorithms can be considered the "CV" as they contain information about the system's knowledge, abilities, and past interactions.

**c) Face Locks:**
Face locks, or facial recognition systems, are used to authenticate a person's identity based on their unique facial features. These systems capture and analyze facial patterns to determine if the person matches the stored data of an authorized user. In the context of face locks, the "CV" would be the database or model that contains information about different individuals' facial features and characteristics. This database acts as the "CV" by storing and comparing data to determine if a person is authorized to access a certain device or system.

In conclusion, all of the given options can be examples of a CV, as they involve the use of algorithms, data, or models that contain information about the capabilities, experiences, or characteristics necessary for their respective functions.