Final answer:
The question seems to involve a term 'RPB' that is not commonly used in computer networking. It might be referring to a type of reliable protocol behavior where typically, each destination would receive one copy of a packet. More context is required for a precise answer.
Step-by-step explanation:
In the context of computer networks and data transmission, the term RPB is not commonly recognized as a standard acronym or terminology. It is likely that this question is referring to Reliable Protocol Behaviour, which is an interpretation of network protocols ensuring reliable data transfer. However, the options listed do not directly relate to a known standard protocol or service within networking concepts. For instance, in relation to network protocols such as TCP (Transmission Control Protocol), the guarantee is usually that each destination receives one copy of the packet, with mechanisms in place to manage the retransmission of lost packets ensuring data integrity and order. In contrast, UDP (User Datagram Protocol) does not guarantee delivery and could potentially fit the 'fragments' option if it refers to the delivery of fragments of a message, but UDP itself does not guarantee that even fragments will be received. Without more context or correct reference to a specific protocol behavior known as 'RPB', it is challenging to provide a definitive answer.