My client has 5 domains, 3 of which (we'll refer to as C, D, and E ) we are being paid to optimize. The first 2 domains (we'll refer to them as A & B), are the oldest and are no longer consistently updated but still get leads daily. The client wants to link A/B to C to help drive the leads. C is the same industry as A/B, just a different business model (think consulting vs an ebook store). I can't emphasize enough that this is strictly white-hat ONLY. Is it safe to have multiple links on relevant pages from A/B leading to C? What do I need to watch out for? They're all hosted on a VPS and have original content separate from each other. Tips very much appreciated, thanks!