What occurs to opportunity and account fields when they are deleted?

When opportunity and account fields are deleted, they are permanently removed from the system and do not appear in any recycling bin. This means that once fields are deleted, they cannot be recovered or restored through standard means available in the platform. Understanding this aspect is crucial for users because it emphasizes the importance of careful consideration before deleting any fields, given that this action cannot easily be undone.

In contrast, the other options suggest that there might be some form of recovery or retention, which is not applicable in this context. For example, the idea of retaining deleted fields in a recycling bin implies that users could easily retrieve them later, which is not the case here. Similarly, the notion of archiving or restoring fields misrepresents the absolute nature of the deletion process. Thus, recognizing the permanent nature of deletions helps users make informed decisions and reinforces the need for data management strategies.