Which three techniques can be used to apply XML Digital Signatures to an XML document? (Choose three.)
A. use detached signatures, where the digital signature covers sibling elements or external data
B. use enveloping signatures, where the digital signature element encloses the data to be signed
C. use enveloping signatures, where the digital signature is a child element of the data to be signed
D. use enveloped signatures, where the digital signature is a child element of the data to be signed
E. use enveloping signatures, where the digital signature element is a child element of the data to be signed