The model highlights the primary or support activities that add a margin of value to a firm's products or services where information systems can best be applied to achieve a competitive advantage. A. value chain B. core competency C. network economy D. Porter's five forces

A. value chain

Explanation:

The value chain is a model that highlights the primary or support activities that add to the margin of the values of products and services and can be best applied to have a competitive advantage and delivers a value product to the market.

With reference to the solutions, following things may be noted1) homogeneous solutions comprises of single phase.2) heterogeneous solution comprises of more than one phase.3) in colloidal solution, solute is evenly distributed in solvent. in such system, it is difficult to separate solute and solvent.4) in suspension, there is an uneven distribution of solute in solvent. in such system, solute and solvent gets separated on standing long.    blood is a homogeneous and colloidal solution,salad dressing is a heterogeneous and suspension solution.