The three Avaya Oceana® common components required for processing all types of interactions (voice, email, chat, sms, etc.) are Omnichannel Controller, Work Assignment (WA), and Customer Controller. Omnichannel Controller manages the different interaction channels to ensure a seamless customer experience. Work Assignment is crucial for assigning interactions to the appropriate agents or resources. Customer Controller is essential for maintaining customer session and context across various interactions, ensuring continuity and consistency.