Venture Capital Valuation Methodology

In the context of Venture Capital (VC) investments, a typical VC financing round involves several stages, including seed funding, Series A, Series B, and beyond. Each of these stages plays a crucial role in determining the valuation of the startup. Consider a VC firm that has invested in a tech startup during its Series A round. At that stage, the firm is working to assess the startup's value based on its expected growth trajectory, market opportunity, and comparable company analysis. Which method is most commonly employed by venture capitalists to estimate valuations in early-stage venture capital investments?