Consider the following features/factors: 1. Projects are of the non-repetitive type 2. Time required need not be known 3. Time required is known precisely 4. Events have been established for planning 5. Emphasis is given to activities of project PERT is preferred for planning because of A. 1, 2 and 4 B. 3, 4 and 5 C. 1, 3 and 4 D. 1, 2 and 5

The correct answer is D. 1, 2 and 5.

PERT (Program Evaluation and Review Technique) is a network analysis technique used in project management to estimate the time required to complete a project. It is a probabilistic technique that considers the uncertainty in the time required to complete each activity in the project.

PERT is preferred for planning projects that are of the non-repetitive type, where the time required to complete each activity is not known precisely. PERT is also preferred for projects where events have been established for planning and emphasis is given to activities of the project.

Option A is incorrect because it includes option 3, which is not a feature of PERT. Option B is incorrect because it includes option 4, which is not a feature of PERT. Option C is incorrect because it does not include option 2, which is a feature of PERT.