How big is the VFAT partition in ESXi5?

A.
544MB

B.
600MB

C.
1.6GB

D.
4GB

Explanation:
http://pubs.vmware.com/vsphere-50/index.jsp?topic=/com.vmware.vsphere.install.doc_50/GUID-F149EDB3-F00F-43AB-9508-72331F4FE8DB.html&resultof=%22vfat%22%20%22scratch%22%20