treatment of transportation charges included in invoice in case of supply of goods.

Bhu J (12 Points)

24 November 2018  
Mr.A supplies goods to Mr.B value -10000 ,GST @ 5%
material is delivered to Mr.B premises by a truck owned by Mr.C
transportation cost-1500 gst 12%
Invoice raised by A to B of 11500 , amount collected from B 11500 and 1500 is paid to Mr.C by Mr.A

now my question is
1) whether such freight is a part of supply, if yes then what gst rate applicable?

2) if mr.C is not a GTA, then the service of transportation will be exempt, if such supply is except, then do we still freight to value of supply

3) in the problem, who will be recipient of transportation service and who will be supplier between A &B and A,&C

4)how can we avoid this addition in value because of freight?