As described under extended namespaces, a message stanza MAY contain any properly-namespaced child element.
In accordance with the default namespace declaration, by default a message stanza is qualified by the 'jabber:client' or 'jabber:server' namespace, which defines certain allowable children of message stanzas. If the message stanza is of type "error", it MUST include an <error/> child; for details, see [XMPP‑CORE]. Otherwise, the message stanza MAY contain any of the following child elements without an explicit namespace declaration:
<subject/>
<body/>
<thread/>
The body, subject, and thread are child elements.
https://xmpp.org/rfcs/rfc3921.html#stanzas
If the message stanza is of type "error", it MUST include an <error/> child; for details, see [XMPP‑CORE].
Child Elements 2.1.2
I think B and D are correct.
https://xmpp.org/extensions/xep-0226.pdf
upvoted 1 times
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skhanfar
6 months, 2 weeks agoJanu82
1 year, 6 months agoRon_Berserker
1 year, 6 months ago