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I am about to purchase an extended warranty for my Canon Pixma MP780 as the 1 year date of my purchase is almost up. I need to choose between Canon direct and Office Depot (where I purchased it). Any recommendations on which option I should choose. Thanks.

I have a Canon PIXMA MP780. Can someone tell me if both black ink cartridges (BCI 6BK and BCI 3eBK) are used for black text printing? Or is one dedicated for text, and the other for something else, perhaps graphics? I keep wondering why there are 2 black cartridges. Thanks.