What would be the reason for a large number of duplicate Account records and many sharing rules created in Salesforce?

Regarding the use of Apex Sharing Reasons, which two reasons should an Architect consider? (Choose two.)

Your company is deploying Chrome devices. You want to make sure the machine assigned to the employee can only be signed in to by that employee and no one else.
What two things should you do? (Choose two.)

Your company policy requires that managers be provided access to Drive data once an employee leaves the company.
How should you grant this access?

Your organization has just appointed a new CISO. They have signed up to receive admin alerts and just received an alert for a suspicious login attempt. They are trying to determine how frequently suspicious login attempts occur within the organization. The CISO has asked you to provide details for each user account that has had a suspicious login attempt in the past year and the number of times it occurred for each account.
What action should you take to meet these requirements?