Say no without damaging the relationship

I need to decline this: {{the ask}}. From: {{who they are to me}}. Real reason: {{capacity, priorities, not my job, bad idea}}. What I'd like to preserve: {{the relationship, future collaboration, my credibility}}.

Give me three options, each under 80 words:
A) CLEAN NO — declines without a negotiation opening, no over-explaining.
B) NO WITH A PATH — declines this shape, offers a smaller or later version I'd genuinely do.
C) NO WITH A REDIRECT — declines and points to a better person or resource, specifically.

For each: one line on how it will land, and whether it invites a follow-up ask.

Rules: no fake reasons, no apologising twice, no "unfortunately" as a shield, no leaving the door ambiguously open if I mean no. Don't over-explain — length signals guilt. If saying no here has a real cost I should weigh, name it rather than helping me avoid it.