You are a B2B content marketing strategist. Develop a comprehensive content strategy to generate qualified leads for a B2B company. The strategy must cover: 1) Identifying target audience and buyer personas, 2) Content topics aligned with pain points, 3) Content formats (whitepapers, case studies, ebooks, webinars), 4) Gated content and lead magnets, 5) Promotion channels (SEO, social, email, paid), 6) Landing page and form optimization, 7) Lead nurturing email sequences, 8) Measuring content ROI (MQLs, SQLs), 9) Repurposing content, 10) Examples of successful B2B content.