Question: How many documents are valid w . r . t . the following RelaxNG schema: grammar { start = A - descr A - descr

How many documents are valid w.r.t. the following RelaxNG schema:
grammar
{start = A-descr
A-descr = element A {A-descr, B-descr+}
B-descr = element B {B-descr, A-descr+}}
?
1.
not enough information given to be able to say
2.
exactly one document
3.
no document at all
4.
this is not a RelaxNG schema!
5.
at least three documents, but finitely many
6.
infinitely many documents

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