#1)
There I believe in all of these there is an assumption on the nest egg that you would also be earning social security. The age is a big determining factor, assuming there was social security of 2,000 per month for a 65 year old standard retiree or $24,000 that leaves (62,500 *.80) -24,000 as the old school rough estimate of what one would need and you would need about 25,000 per year to meet #1 for a 5% withdrawl, which for 30 years would have on average about an 86% chance of survival on many studies
Retirement Planning by Targeting Safe Withdrawal Rates
This puts a very real risk of running out, the younger you are than 65 the more likely that your portfolio of 500,000 is not enough and other plans need to be made, assuming you could even cut 20% of your spending. This provides 49,000 per year of income available.
#2) I am assuming this for an age 65 retiree who would have 24,000 in social security, he takes 43,000 per year for 5 years depleting portfolio to 285,000 and then has 36,000 in social security and a very conservative 2.5% withdrawal from the remainder after age 70 from the 285,000 portfolio. This portfolio counts much more heavily on social security but is probably better inflation protected and safer than #1
#3) Due to ZERP this is becoming fashionable on what safe withdrawal now is, certainly that level of withdrawal is much more likely to be sustainable but would require a cut to 39,000 in spending from 62,500. That $4,000 cut from #2 is very possible but probably tough.
#4) This gets you to 44,000 in the example given same basically as #2 only with more reliance on the portfolio instead of social security.
It comes down to personal preferences and how one judges the future. Not knowing anything else about a person and given facts of a 65 year old and 500K I would recommend #2 as the most sure income consistently throughout retirement, and shows in the era of low interest rates the value of deferred social security. Good expense control and budgeting are the key to not running out of money.