Simple Object Access Protocol (SOAP) uses Extensible Markup Language (XML) for data passing, and it must rely on the encryption of those data packages for security. TLS and SSL (before it was deprecated) represent two commons approaches to using encryption for protection of data transmissions. However, they are only two possible options and do not encapsulate the overall concept the question is looking for.
Tokenization, which involves the replacement of sensitive data with opaque values, would not be appropriate for use with SOAP because the actual data is needed by the services.

Explanation
To monitor data at rest appropriately, the DLP solution would be installed on the host system where the data resides. A database server, in some situations, may be an appropriate answer, but the host system is the best answer because a database server is only one example of where data could reside. An application server processes data and typically sits between the data and presentation zones, and as such, does not store data at rest. A network firewall would be more appropriate for data in transit because it is not a place where data would reside.

Measured service is the aspect of cloud computing that pertains to cloud services and resources being billed in a metered way, based only on the level of consumption and duration of the cloud customer. Although they sound similar to the correct answer, none of the other choices is the actual cloud terminology.

Explanation
Measured service means that costs are only incurred when a cloud customer is actually using cloud services.
This is ideal for a business continuity and disaster recovery (BCDR) solution because it negates the need to keep hardware or resources on standby in case of a disaster. Services can be initiated when needed and without costs unless needed.