question: What is Shannon's classical source coding theorem? option 1: A theorem that provides the optimal encoding scheme for a given analog signal. option 2: A theorem that provides the minimum distortion achievable in encoding a Gaussian stationary input signal. option 3: A theorem that provides the minimum number of bits required to represent a digital signal. option 4: A theorem that provides the maximum bitrate that can be achieved while maintaining a minimum distortion. option 5: A theorem that provides the maximum distortion that can be achieved while maintaining a fixed bitrate. 