Final answer:
The percentage change of stock ownership that must occur before the board must be notified is 10%.
Step-by-step explanation:
The percentage change of stock ownership that must occur before the board must be notified depends on the regulations set by the stock exchange or governing body. Owning stock means being one of the owners of a company. Company owners are assigned ownership units called shares. Ownership is the legal right to use, possess, and give away a thing. Ownership can be tangible such as personal property and land, or it can be of intangible things such as intellectual property rights. The number and importance of shares an owner has depend on how soon and how much they invested in the company. Typically, a threshold of 10% is required for stock ownership before the board must be notified. Therefore, the correct answer is a) 10%.