Explanation:

- Option 1: Morocco

- Historical Background: Morocco and Cuba had official diplomatic relations until 1980, when they were severed.

- Diplomatic Update: In 2017, Morocco re-established diplomatic ties with Cuba after 37 years.

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- Option 2: Ghana

- Diplomatic Status: Ghana has maintained consistent diplomatic relations with Cuba since the 1950s.

- Option 3: Zimbabwe

- Diplomatic Status: Zimbabwe and Cuba have maintained continuous diplomatic relations since Zimbabwe's independence in 1980.

- Option 4: Sudan

- Diplomatic Status: Sudan has ongoing diplomatic relations with Cuba that have been in place without significant interruption.