Answer:
The kind of corporate takeover technique implemented in the film is proxy fight.
Explanation:
A proxy fight is termed as a technique where two corporate factions ask the stakeholders for the proxy votes such that the right of voting is transferred.
In this case both the parties, the heiress as well as the opponent is asking for the right of vote from stakeholders so that they can decide the corporate future. This is the key feature of the proxy fight and thus this is the correct option.