According to 1982 FTC General Guideline For Mergers, which of the following is true?

a.

If HHI > 1,000 but less than 1,800 after merger, FTC will generally consider action if HHI rises by more than 50;

b.

If HHI > 1,800 after merger, the merger is generally blocked if the HHI rises by more than100;

c.

Any merger proposal should be blocked for its anti-competitive impact.

d.

If HHI < 1,000 after merger, no action will be taken by FTC;