Assuming it does not get bought out, Lumen now has a tremendous opportunity. Three months ago, if you asked investors where telco Lumen Technologies (LUMN 0.78%) would be in five years, they might have argued about whether it would exist at all. Heavily indebted and priced like a stock headed into bankruptcy, most investors had lost faith in the company. Perceptions changed in late July when it announced a partnership with Microsoft to connect its data centers and expand its network capacity. Lumen has sinc ...