Invoke is defined as: (1) To mention (someone or something) in an attempt to make people feel a certain way or have a certain idea in their mind. (2) To refer to (something) in support of your ideas. (3) To make use of (a law, a right, etc.).

Evoke is defined as: “(1) To bring (a memory, feeling, image, etc.) into the mind. (2) To cause (a particular reaction or response) to happen.

Machine Briefs:
Option #1: invoke= IN/VOEK
Option #2: invoke= KBOEK

Option #1: evoke= AOE/VOEK
Option #2: evoke= EFK
Option #2: evoke= AOEFK