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Write a Select Case statement that tests the value of the integer variable semester Average and assigns a grade to the string variable grade based upon the usual criteria (i.e., greater than or equal to 90 is an A, between 80 and 89 inclusively is a B, etc).  If the average falls outside the range of 0 and 100, grade should be assigned the empty string and the message “Invalid semester average” should be displayed in a message box.