Applications of AI (Artificial Intelligence) are

Artificial Intelligence (AI) refers to computer systems designed to perform tasks that typically require human intelligence — understanding language, recognising patterns in speech or images, and learning from data to make predictions or recommendations. Its applications span domains such as natural-language processing, speech processing, computer vision, and recommendation systems.

Applying this to the options offered:

• Machine translation converts text or speech from one language into another using neural language models — a natural-language-processing AI application.

• Speech recognition converts spoken audio into text using acoustic and language models — a speech-processing AI application.

• Product recommendation analyses user behaviour and preferences using collaborative-filtering and content-based algorithms to suggest relevant items — a recommendation-system AI application.

Independent industry references — for example IBM's documentation on machine translation and speech-to-text, and Google Cloud's documentation on speech services and recommendation systems — confirm all three as standard, well-established AI/ML use cases, so none of them can be excluded.

Since machine translation, speech recognition, and product recommendation are each genuine, independently confirmed AI applications, the option naming all three together — "Machine translation, speech recognition, and product recommendation" — is the correct answer.