Final answer:
The true statements concerning planning are that it continues during development and postdelivery maintenance, initial planning is not enough, and it must proceed throughout the project. The correct option is 4: 1, 2, and 3 above only.
Step-by-step explanation:
1, 2, and 3 above only. This selection is based on the principles that planning is an iterative and continuing process that does not cease with initial development but extends to postdelivery maintenance. It highlights that initial planning alone is insufficient for a project's success and that planning must be integrated throughout the project to address emerging complexities and changes in requirements.
Effectively, planning plays a pivotal role in guiding the process of development, ensuring that objectives are met and resources are efficiently utilized. It is a deliberate process that evolves with the project and involves reassessment and adjustments as new information and challenges come to light. The need for continuous planning in projects is underscored by the ongoing evaluation and refinement required to achieve desired outcomes and to account for changes within a project's lifecycle.