In the Construction/Contract Administration phase, which of the following services are considered basic, which are additional?
1. forward all instructions from the client to the contractor;
2. carry out and coordinate as applicable the General Review / Field Review of the Work;
3. keep the client informed of the progress and quality of the Work, and report to the client defects and deficiencies in the Work;
4. Full time on-site Project Representation;
5. require special inspection or testing of work, whether or not such work has been fabricated, installed or completed;
6. Review of contractor's As-built Drawings;
7. prepare change orders and change directives for the client's approval;
8. furnish supplemental instructions to the contractor; 9. receive from the contractor and forward to the client for the client's review the written warranties and related documents;
10. prior to the end of the period of one year following the date of Substantial Performance of the Work, review any defects or deficiencies which have been observed and reported during that period;
11. issue certificates for payment;
12. issue a certificate of final payment;