Added a Runtime Exception for improper argument
Added a Runtime Exception for improper argument

Added a Runtime Exception for the setType() method if the argument does not match one of the
three specified types.  Reformatted if {} else if {} else block properly.  Consider using an enum
instead of string arguments or using three separate set methods [setTypeHypervisor(), setTypeVirtual(),
setTypePhysical()] as an alternative design pattern.
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