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During translocation of sugars in plants from source to sink:

1. The loading of sugar at source is by active transport and unloading at the sink by passive transport.

2. The loading of sugar at source is by passive transport and unloading at the sink by active transport.

3. Both loading at the source and unloading at the sink are by active transport.

4. Both loading at the source and unloading at the sink are by passive transport.