ejabbed pubsub questions

Hi,

I have been exploring ejabberd pub-sub, and I have some question regarding the expiration and persistence

1. Is it correct to say that Item published to a Node is by default persistent ?
2. When will the Item in a Node expire ?
3. If a Node has been up for 2 months, and has been published by Items 1000 times, and a Client then subscribe to the Node, how many Items the Client will receive ?

I cannot find the info everywhere, any clues will be much appreciated.

Big Thanks in advance,

rudhiw

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