During the seating of a tyre bead, the bead refuses to pop into place at 40 PSI. What is the correct and safe next step?

1. Hit the tyre sidewall with a heavy sledgehammer to shock it onto the bead
2. Continue inflating the tyre up to 80 PSI or until it pops
3. Deflate the tyre completely, break the bead, re-lubricate the bead and rim, and try inflating again within safe limits
4. Heat the rim with an oxy-acetylene torch to expand the metal