What does this code do?Code:@media only screen and (max-width:

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What does this code do?

Code:
@media only screen and (max-width: 768px) {
    class*="col-"] {
        width: 100%;
    }
}

1. Error occured
2. When the screen gets larger than 768px, each column should have a width of 100%.
3. When the screen gets smaller than 768px, each column should have a width of 100%.
4. All of above
5. None of these

Correct Option: C

When the screen gets smaller than 768px, each column should have a width of 100%.