2) Leave the money in my account even though I am no longer an employee until I turn 70 1/2 and must withdraw the money
3) Roll the money into my new employers deferred comp program
Agreed that #1 is probably not a good choice.
To choose between #2 vs. #3: exactly what is the "new employers deferred comp program" - another 457, or a 401k, or a 403b, or...?
If another 457, then compare investment options and fees and leave/move the money where the options and fees are best.
If not another 457,
note that "if you roll over your governmental 457 plan to a traditional IRA, 401(k), or 403(b) plan, your 457 savings becomes subject to those plans. Consequently, you'll incur the 10% early withdrawal tax if you make withdrawals before age 59 1/2...." In that case, it's probably better to choose option #2 unless those options and fees are egregious.