Explanation:

- Execute means to carry out, perform, or put into effect something, such as a plan or action.

- Option 1: Occupy refers to taking up space or time, or residing in a place. It's not related to carrying out an action.

- Option 2: Variety indicates diversity or a range of different things. It doesn't relate to performing a task or action.

- Option 3: Apply means to make use of, put to use, or request something. It is somewhat related but not as close as the correct synonym.

- Option 4: Implement means to put into effect or execute a plan or scheme.