That likely means US and Israel. Unclear if countries like the UK that are facilitating the US through use of their bases would be considered legitimate targets (likely yes).
$130,000 a pop in 1980s money, probably even cheaper if you have trade inroads with China and a bunch of 533mm torpedos sitting around in storage.
And as another commenter noted, mines get moved by currents, so the cable could get tangled and snap.
According to guys in the know, they have quite the hardware:
You have to be mindful of enemy tampering, but overal I would say the idea's worth investigating.
On an unrelated note, I was also thinking of using fiber optic drones to rapidly set up an unjammable communications network on the battlefield. Surely that would be useful for something?
Remember, the strait is not Iranian property, but International waters. So no one would have to ask them for permission, but that is the way it is and most do not risk it (insurance won't cover).
That seems to depend on who you ask. Iran has expressed a differing opinion on the matter and appears to be capable of striking the area in practice.