Stateless protocol that extends SOAP by defining a means to specify an ordered route is
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WS-Routing
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WS-Referral
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Not possible in SOAP.
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a & b
WS-Routing is a stateless protocol that extends SOAP by defining means to specify an ordered route for message transmission. It introduces SOAP headers that define the path a message should take through intermediaries. This enables explicit routing control while maintaining statelessness. Option A is correct.
The description 'stateless protocol that extends SOAP by defining a means to specify an ordered route' is the textbook definition of WS-Routing (SOAP-RP). WS-Routing is a SOAP-based, stateless protocol for carrying a message from an initial sender to an ultimate receiver via a set of intermediaries; it embeds the route in the SOAP header (using 'via' elements) so an ordered path can be specified, and optionally a reverse path for replies. WS-Referral is a different, complementary protocol: it dynamically configures/updates the routing entries (referral rules) that WS-Routing routers use to redirect messages. It is about how routers exchange routing information, not about defining the ordered route itself. So the DB's marked answer (WS-Referral) is wrong; WS-Routing is correct.