Final answer:
The requirement in a bond indenture preventing investment in highly speculative projects is an example of a negative covenant, designed to protect bondholders by limiting certain corporate actions.
Step-by-step explanation:
A requirement in the bond indenture that the corporation cannot invest in highly speculative projects is an example of a negative covenant. This type of covenant restricts certain actions by the corporation in order to protect the interests of the bondholders. Negative covenants are often included in the terms of a bond to prevent the borrower from engaging in risky activities which could compromise their financial stability and ability to make interest payments or repay the principal on the bond.