You are the project manager for the GRT Project in your organization.

PERT uses the formula of (O+4M+P)/6 to predict the duration of the project activities and the overall project schedule. Three-point estimate is a way to enhance the accuracy of activity duration estimates. This concept is originated with the Program Evaluation and Review Technique (PERT). PERT charts the following three estimates: Most likely (TM): The duration of activity based on realistic factors such as resources assigned, interruptions, etc. Optimistic (TO): The activity duration based on the best-case scenario Pessimistic (TP): The activity duration based on the worst-case scenario The expected (TE) activity duration is a weighted average of these three estimates: TE = (TO + 4TM + TP) / 6 Duration estimates based on the above equations (sometimes simple average of the three estimates is also used) provide more accuracy.

Answer option A is incorrect. This is not a valid formula.

Answer option D is incorrect. This almost describes the three-point estimate, but does not answer the question about PERT.

Answer option B is incorrect. This is the formula for the three-point estimate. Note the PERT, while similar, uses 4M and divides the result by six factors.