Question

Which sentence below is properly punctuated?
a.
When you arrive on the train, take a taxi to the bus station; I can meet you at the bus station.
b.
When you arrive on the train: take a taxi to the bus station; or I can meet you at the train.
c.
When you arrive on the train, take a taxi to the bus station. or I can meet you at the train.
d.
When you arrive on the train, take a taxi to the bus station, I can meet you at the bus station.