Which one of the following best describes a "user co-ordinate System"?

Submitted by: Administrator
(a) The pair of co-ordinate points which define the lower left and upper
right corners of the drawing boundary
(b) A series of co-ordinate points stored as variables for later use in the
drawing
(c) A co-ordinate system whose origin is located anywhere in three
dimensional space
(d) The master datum from which all measurements are taken.
Submitted by: Administrator

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