What is the minimum spacing of bolts specified by AISC? and preferred spacing?  A. 1 1/4 times the diameter of the bolt; 2 times preferred  B. 1 3/4 times the diameter of the bolt; 2 1/4 times preferred  C. 2 1/3 times the diameter of the bolt; 2 2/3 times preferred  D. 2 2/3 times the diameter of the bolt; 3 times preferred  E. 3 times the diameter of the bolt; 3.25 times preferred   
 
 
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