Which one of the following actions will tend to increase the systematic risk of a portfolio?
The sale of U.S. Treasury bills and an offsetting purchase of a stock with a beta of 0.21
The sale of U.S. Treasury bills with the proceeds held in cash
The sale of a stock with a beta of .67 and an offsetting purchase of U.S. Treasury bills
The sale of high-beta stock and an offsetting purchase of a low-beta stock
The sale of a stock with the proceeds held in cash