When a B-lymphocyte cell produced antibodies, are the antibodies produced on the surface or released?

How is a B Lymphocyte activated?
What causes the B Lymphocyte to release the antibody?
Do some Antibodies stay on the B Lymphocyte's surface (my textbook says there are antibodies on its surface to activate it)
Then how does Phagocytosis happen? Do the phagocytes have antigen receptors or antibody receptors?

What is a VPN?

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