Termination; Amendment a. In addition to the automatic termination of this Agreement specified in Section 1.c. of this Agreement, each party to this Agreement may unilaterally cancel its participation in this Agreement by giving thirty (30) days prior written notice to the other party. In addition, each party to this Agreement may terminate this Agreement immediately by giving written notice to the other party of that other party's material breach of this Agreement. Such notice shall be deemed to have been given and to be effective on the date on which it was either delivered personally to the other party or any officer or member thereof, or was mailed postpaid or delivered to a telegraph office for transmission to the other party's designated person at the addresses shown herein or in the most recent NASD Manual.