The long/short equity strategy involves taking a long position in stocks that are undervalued and a short position in overvalued stocks. This strategy is based on the fund manager's ability to accurately assess the value of stocks. In a long position, the manager buys stocks that are undervalued with the expectation that their price will increase. On the other hand, in a short position, the manager borrows and sells overvalued stocks with the expectation that their price will decrease, allowing them to be bought back at a lower price for a profit. The success of this strategy depends on the manager's ability to accurately identify overvalued and undervalued stocks and to balance the long and short positions so that the value of the shares shorted equals the value of those bought and both portfolios have the same sensitivity to market movements. If executed well, this strategy can yield good returns in both bull and bear markets.

Choice B is incorrect. This choice suggests taking a long position in both overvalued and undervalued stocks, which contradicts the basic principle of the long/short equity strategy. The strategy involves buying undervalued stocks (long position) and selling overvalued ones (short position), not buying both.

Choice C is incorrect. Similar to Choice B, this option also proposes taking a long position in both overvalued and undervalued stocks. This does not align with the concept of the long/short equity strategy as it does not involve shorting any stock.

Choice D is incorrect. Taking a long position only in overvalued stocks would be against the principles of value investing which forms part of the basis for a long/short equity strategy. In such strategies, investors typically take short positions in overvalued stocks while going long on undervalued ones.