What is the correct process to respond to the Examining Authorities written questions? Which questions should be responded to?

The Examining Authority (ExA) has issued its first round of questions following the consideration of the application documents and submitted Relevant Representations. The questions are addressed to the Applicant as well as specific organisations and interested parties, although anyone has the opportunity to respond to them. If there are questions addressed to your organanisation, a responce would be appreciated to give the ExA the information they require.
Your response should be sent to the project mailbox: [email protected] by the deadline of 21 October 2013.