Correct Answer: Formalise

Solution : The fourth option is correct.

Abolish means to completely do away with something, while formalise means to make something official or established, which is the opposite action as it involves creating or establishing something rather than getting rid of it.

The meanings of the other options are as follows:

• Efface means to erase or wipe out.
• Deface means to mar or spoil the appearance of something.
• Jettison means to discard or throw away.

Therefore, the correct answer is formalise.