A resource-based strategy: a. is often based on cross-department combinations of intellectual capital and expertise.
b. uses a company's valuable and rare resources and competitive capabilities to deliver value to customers that rivals have difficulty matching.
c. is typically based on a stand-alone resource strength such as technological expertise.
d. refers to a company's most efficiently executed value-chain activity.
e. uses industry key success factors to provide a company with a core competence that rivals cannot effectively imitate.

b. uses a company's valuable and rare resources and competitive capabilities to deliver value to customers that rivals have difficulty matching.

Explanation:

Resources refers to competitive and valuable assets, organizational processes, capabilities, information, attributes, and knowledge that are acquired, owned and controlled by an organization. These resources are classified into two (2) main categories;

1. Tangible resources: these are physical assets such as equipments, financial assets, plants, raw materials, inventory etc that are owned and controlled by an organization.

2. Intangible resources: these are assets that are abstract in nature such as knowledge, customer loyalty, skills, experience, stakeholders, patent, culture, buyer recognition etc.

Hence, a resource-based strategy uses a company's valuable and rare resources and competitive capabilities to deliver value to customers that rivals have difficulty matching. This ultimately implies that, resource-based strategy avails a company the ability or opportunity to use their tangible and intangible assets to provide finished goods and services to meet the needs or wants of customers, as well as creating a competitive advantage over rivals in the same industry.

answer: it is a cellular phone