ESP8288 IOT Board & I2C Ports

I have just purchased an ESP8266 IOT Board Version 1.0 and I would like to connect a crowtail BME280 Sensor to it. This is an I2C device, but I am having trouble woring out which ports are the default I2C Ports on the ESP8266. Could somebody please help and let me know.
Thanks for any help in advance.

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