 valid for at least three
     years, to give any third party, for a charge no more than your
     cost of physically performing source distribution, a complete
     machine-readable copy of the corresponding source code, to be
     distributed under the terms of Sections 1 and 2 above on a medium
     customarily used for software interchange; or,

<P>
<LI><STRONG>c)</STRONG>
     Accompany it with the information you received as to the offer
     to distribute corresponding source code.  (This alternative