Answer (B) is correct . Exponential smoothing is a sales forecasting technique used to level or smooth variations encountered in a forecast. It also adapts the forecast to changes as they occur. The simplest form of smoothing is the moving average, in which each forecast is based on a fixed number of prior observations. Exponential smoothing is similar to the moving average, but the term "exponential" means that greater weight is placed on the most recent data, with the weights of all data falling off exponentially as the data age.
Answer (A) is incorrect because Linear programming is used to minimize a cost function or maximize a revenue or profit function, subject to constraints.
Answer (C) is incorrect because Queuing is used to minimize the cost of waiting lines.
Answer (D) is incorrect because PERT is used to monitor the progress of large multi-step projects, such as construction of a building.
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