Thank you. I guess I'll start off with the lowest fee vehicle then, which is the Vanguard one.
For some reason, the BlackRock funds we have are up to 0.28% in fees so I will be avoiding that for now.
Picking "Vanguard Short-Term Bond Index (VBIPX)" is similar to holding cash. You should not put everything there just because it has the lowest expense ratio.
I suspect you're new to investing, so let me suggest a portfolio and explain why, with a book recommendation as well.
60% BlackRock Large Cap US Equity Index
20% BlackRock Russell 2500 Index
20% international, using the lower expense ratio between (a) and (b)
(a) BlackRock MSCI ACWI Ex-US Index
(b) MFS Institutional International Equity (MIEIX)
The S&P 500 actually has about 80% of the US stock market by weight. But a fund or ETF with "S&P 500" in its name must pay S&P for the privledge. I expect almost 100% overlap with a "large cap" fund, perhaps with more stocks in it. That's why the biggest holding is the largest stocks in the US market.
That "Russell 2500" fund holds small and mid cap stocks. It's roughly the right proportion, but it's also nice to keep your allocation simple. These stocks help give you exposure to the entire US stock market.
Finally, an international ETF. Diversification means when the US drops, international might not. Often they both crash together (like 2022 or 2020), but there are times when international provides diversification.
Please check out "A Random Walk Down Wall Street" from any library - even outside the United States you'll find a copy. Any edition of that book will help you understand a bit about portfolios and passive investment - with historical data to back up its claims.