What do you understand by the term "Balance of trade"?

Difference between value of exports and imports of visible items 

the correct answer is Option 1: Difference between value of exports and imports of visible items

Balance of trade refers to the difference between value of exports and imports of visible items only. It does not include the transactions involving invisible items. For example: shipping, banking, insurance etc. 

The balance of trade specifically measures the net export or import of these physical goods, distinguishing it from the broader "current account," which also includes invisible items like services, income, and transfers.