Which one of these statements is correct?

Fixed stock repurchases allow managers to repurchase shares only when they feel those shares are undervalued.

Stock repurchases send the exact same signals to investors as do cash dividends.

A fixed stock repurchase plan could be a negative net present value investment for the stock issuer.

It is relatively easy to determine whether or not a firm has completed a planned stock repurchase.

Since the early 1980s, it has become increasingly more difficult to do a stock repurchase due to SEC regulations.