Which of the following is punctuated $$orrectly$?$

The old office space was dark and cold; it seemed depressing.

The old office space was dark and cold, it seemed depressing.

The old office space was dark and cold it seemed depressing.

Which of the following is punctuated correctly?

We went on a tour of our companies in Flensburg, Germany; Copenhagen, Denmark and Stockholm, Sweden.

We went on a tour of our companies in Flensburg, Germany; Copenhagen, Denmark; and Stockholm, Sweden.

We went on a tour of our companies in Flensburg, Germany Copenhagen, Denmark; and Stockholm, Sweden.

Which of the following is punctuated correctly?

I saw Emily Zhou, regional sales officer Daniel Ortega, president of SellPlus; and Lupe Hernandez, vice president of sales.

I saw Emily Zhou, regional sales officer Daniel Ortega, president of SellPlus and Lupe Hernandez, vice president of sales.

I saw Emily Zhou, regional sales officer; Daniel Ortega, president of SellPlus; and Lupe Hernandez, vice president of sales.