$3.$ The organization that you work for just concluded an investigation of a USB thumb drive that was lost and contained a file with the information of $765$ patients on it$,$ including their name, address, telephone number, and Social Security number. As the privacy officer, you are required to manage the notification process for the data breach. Complete the following as it pertains to the above data breach:

a$.$ Describe who would need to be notified of the data breach based and the timeline for the notification requirement.

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b$.$ Compile a list of what should be included in the letter to send to the individuals impacted.