Final answer:
Diego's recent diagnosis of dyspraxia is his personal medical information and should be kept confidential. You should report this information to no one unless Diego has given his consent or there are critical health and safety concerns that necessitate disclosure.
Step-by-step explanation:
If your colleague Diego has confided in you about his recent diagnosis of dyspraxia, you should respect his privacy. The correct action to take is option 4) No one. It is Diego's personal medical information, and without his explicit consent, it is not appropriate for you to share this information with anyone, including his team lead, manager, or human resources. It is important to maintain confidentiality unless Diego has asked for assistance in informing his workplace or if there are predefined health and safety reasons to report such information.