Does the BPC case continuance letter need to be signed only by the employer or can the attorney of record sign?

According to the Labor Department:

The Selection of Continuation Option Letter may be signed and submitted by either the employer or the employer's attorney/agent of record. We request, however, that employers and attorneys coordinate to determine who will submit the Selection of Continuation Option Letter to ensure that the appropriate Backlog Processing Center does not receive conflicting or duplicate responses. In the instance of conflicting responses, we will default to the employer's response.