questions

[pkcd12]

This is regarding meeting the 200k investment requirement for LTR (2-year extension) or ILR.
I have read the rules carefully and understand that (A) I must inject 200k into my UK corporate account from my (or 3rd party's) personal account as a Director's loan, (B) I can spend part or all of it for legitimate business reasons and (C) the company should still have access to whatever I don't spend.

So my questions are:
1. Does the 200k have to be injected in ONE SHOT at the beginning or can it be injected bit by bit over the initial three years of the visa?
2. From an accounting standpoint, "investment" is different from "expenses" (although sometimes it can be fuzzy). So what exactly does HO mean by "investment"? Does it include the usual running costs of a business like salaries, bills, etc, or does it have to be STRICTLY investment in the traditional sense, such as buying company assets, paying for marketing campaigns, etc.?

Thank you for all informed responses.