Final answer:
The components of open disclosure of medical error except for an explanation of the error in lay language.
Step-by-step explanation:
The subject of this question is Medicine. It is asking about the components of open disclosure of medical error.
The correct answer is 2) An explanation of the error in lay language. An explanation of the error in lay language is an important component of open disclosure, as it helps the patient understand what happened without using complex medical terminology.
The other components mentioned in the question are all part of open disclosure. An apology to the injured patient is important for acknowledging the harm caused, a best guess as to why the error occurred shows transparency, and an assurance that a full investigation will take place reassures the patient that steps will be taken to prevent similar errors in the future.