A. Z \sim N(\mu \_1, \sigma \_1^2+ \sigma \_2^2) B. Z \sim N(\mu \_1+ \mu \_2, \sigma \_1\sigma \_2); C. Z \sim N(\mu \_1+ \mu \_2, \sigma \_1^2\sigma \_2^2) D. Z \sim N(\mu \_1+ \mu \_2, \sigma \_1^2+ \sigma \_2^2)...