Workbook 6: The Bash Shell 
Chapter 3. Shell and Environment Variables 
Questions

In an effort to set his timezone to MDT [...deleted...]

TZ=MDT

[...more deletions...]

4.  What change should elvis make to correct his mistake? 
   A.  He should Modify the line added to the .bashrc to read export 
TZ=MST  
   B.  Run the command chmod a+x ~/.bashrc  
   C.  He should modify the line added to the .bashrc to read TZ=MST; 
export TZ  
  D.  Either A or C  
   E.  None of these steps would solve the problem.  

Both A&C say:     MST

When they should say:     MDT