Terry owns $100\%$ of IBM Ltd and $100\%$ of both EFG Inc. and MBA Inc. respectively hence they are all associated. Terry also owns $60\%$ of Apple Ltd and $10\%$ XYZ Ltd$.$ which the first one is associated and the second is not associated companies. Each of the five corporations has $$400,000$ of active business income earned in Canada.

What is the maximum combined corporate income on which the five corporations can claim the small business deduction?

Group of answer choices

$$900,000$

$$2,000,000$

$$1,000,000$

$$800,000$