What is the safest fund in TSP?

Can you elaborate on the safest fund option available within the Thrift Savings Plan (TSP)? Are there specific funds that have historically shown lower volatility and more stable returns compared to others, making them more suitable for risk-averse investors? Additionally, how do these funds allocate their assets, and what factors should investors consider when selecting a fund for their TSP portfolio, especially if they're prioritizing safety over potential growth?