All of the statements are true regarding multifactor models. Multifactor models expand on single-factor models (like the CAPM) by taking into consideration multiple risk factors that drive asset returns. Because they include multiple factors, they naturally contain multiple betas, each measuring the asset's sensitivity to a particular risk factor. Finally, similar to the CAPM, multifactor models assume that idiosyncratic (asset-specific) risk can be diversified away in a well-constructed portfolio, leaving only the exposure to the systematic risk factors.