✅ Correct Answer: All of these
WhatsApp (A): Supports sharing of videos, documents (PDF, Word, etc.), and files (up to a size limit).
YouTube (B): Primarily for videos, but also allows documents (e.g., in descriptions) and files via links.
Skype (C): Enables sharing videos (calls/recordings), documents, and files during chats or calls.
Source: This question is taken from the OFFICE ASSISTANT (BS-16) Housing Urban Development