Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'When the Chief Executive Officer of the Company serves as the Chairman of the Board , unless the independent directors decide otherwise , the Chairman of the Audit Committee will preside at meetings of the Board at which the Chairman of the Board and Chief Executive Officer is not in attendance , and at executive sessions of the independent directors of the Board .', Argument/Subject 1: 'chairman', Argument/Subject 2: 'board'
Output:
be officer of