Which relative clause is correct
The technology of electronic devices, which among them the most important is computer, plays an important role in people's lives.
The technology of electronic devices, among which the most important is computer, plays an important role in people's lives.
The technology of electronic devices, among which the computers are the most important ones, plays an important role in people's lives.
For sentence #1, I don't know if which among them is correct or not because it repeats them, which is considered to be the same which.
For sentence #1 and #2, I don't know if there is a noun required after most important or not like the most important one.
For sentence #2 and #3, I don't know which is the natural word-order.