Answer: a) UDP(User Datagram Protocol)
Explanation:
UDP(User Datagram Protocol) is the protocol that is responsible sending files and data .It is a connectionless network protocol so it does not form link for transmitting data over the network.
- It has the ability to distribute duties to the network servers of files and data of different computers systems for accurate transmission without particular series of deliveries.
- Other options are incorrect because Bit-Torrent,Dropbox and file transfer protocol does not spread file server role on the network.
- Thus, the correct option is option(a).