Which of the following estates will most likely have the greatest liquidity problem?

1. An estate comprised of a closely held business interest valued at $6,000,000, and subject to a life insurance funded Buy/Sell Agreement, and $700,000 in cash.
2. An estate comprised of a closely held business interest valued at $6,000,000 and cash of $100,000.
3. An estate comprised of $1.5MM of rental real estate and marketable securities totaling $5,000,000.
4. An estate with $4,000,000 of marketable securities.