Which two child elements can be in an XMPP message stanza? (Choose two.)

Which two child elements can be in an XMPP message stanza? (Choose two.)
A . <server/>
B . <error/>
C . <client/>
D . <body/>
E . <subject/>

View Answer

Answer: DE

Explanation:

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/>