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Giving reasons for your answer, suggest which dependability attributes are likely to be most critical for the following systems:

  • An Internet server provided by an ISP with thousands of customers 
  • A computer-controlled scalpel used in keyhole surgery 
  • A directional control system used in a satellite launch vehicle 
  • An Internet-based personal finance management system

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Internet server: Availability as failure of availability affects a large number of people, the reputation of the supplier and hence its current and future income. 

A computer-controlled scalpel: Safety as safety-related failures can cause harm to the patient. 

A directional control system: Reliability as mission failure could result from failure of the system to perform to specification. 

An personal finance management system: Security because of potential losses to users.

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