Final answer:
In the growth-share matrix, high-growth, high-share businesses or products are called (b) Stars. They are strong performers in a growing market but require significant investment to maintain their position.
Step-by-step explanation:
The growth-share matrix defines four types of Strategic Business Units (SBUs). The type of SBU that is characterized by high-growth and high-share businesses or products is called Stars. These SBUs are leaders in a high-growth market and typically require substantial investment to maintain their market position and support their rapid growth.
In contrast, Dogs are low-growth, low-share businesses or products, Cash cows are low-growth, high-share businesses, and Question marks are high-growth, low-share businesses that require careful consideration to determine if they can become Stars or should be divested.