You and I have the same overall AA... 60/35/5.
I divide equities into 70% US, 27% developed international and 3% emerging markets. I divide fixed income into 64% US investment grade, 16% US high yield, 17% developed international and 3% international emerging markets. I concede that I probably slice and dice more than necessary.
For US investment grade, I hold PenFed 3%/5 year CDs and target maturity corporate bond ETFs from Guggenheim and Blackrock that mature in 2020 (and a whole life policy that I bought in my 20s that pays ~4%). The ERs for the ETFs are .24% and .10%, respectively. For US high yield, I invest in Guggenheim Bulletshare ETFs maturing in 2017 to 2019 that have a .40% ER. The last time I checked, the weighted average yield for the above was 2.8% and the weighted average duration was 3.1. I concede that I am giving up some yield in my efforts to mitigate interest rate risk.... which so far has been a bit of a fool's errand.
If I had a lot of cash to invest in fixed income, I might take a hard look at the Andrews CU 3%, 7 year CDs recently offered. In fact, I'm considering swapping it out for my Guggenheim Bulletshares and IBonds.
I hold my cash in a Discover Bank online savings account that pays 0.95%.
I'm not keen on US treasuries... I think they are still as Warren Buffet said, return-free risk.... in the near term. I guess of the three alternatives you posted that #3 would be my preference.