Which SBO method signature is valid for conversion to a web service?

Which SBO method signature is valid for conversion to a web service?

A.
voidsetKeyword(IDfSysObject obj, int index, String value)

B.
booleanuploadConfiguration(java.io.File myFile)

C.
booleansetKeyword(IDfSysObject obj, int index, String value)

D.
intcountDocuments(IDfSession sess, String qualification)