SN65DP159: SMARC module and DDC signals

Part Number: SN65DP159

Hello,

Could you confirm if when SDA/SCL from the source is connected directly to the SDA/SCL sink then SCL_SRC and SDA_SRC pins must be pulled to ground or to VCC?

In addition I would ask if SDA_SNK and SCL_SNK can work properly at 3.3Vdc (level shifter with pull up to 3.3Vdc instead of 5V)

Thanks

Lorenzo