Correct Answer - Option 1 : Both deterministic and fully observable
The correct answer is "option 1".
Explanation
Planning is the task of coming up with a sequence of actions that will help to achieve a goal.
Examples of planning agents are Search-based problem-solving agents and logical planning agents.
In a classical planning environment, only those environments are considered that are fully observable, deterministic, static, and discrete.
Non-classical planning is for a partially observable & stochastic environment.
Hence, Standard planning algorithms assume the environment to be both deterministic and fully observable.