‘Diamond Ring’ is a phenomenon observed

The correct answer is Option 3.

The ‘Diamond Ring’ effect is a celestial phenomenon occurring during a total solar eclipse. It happens just seconds before the moon completely covers the sun (totality) and immediately after totality ends. It occurs when only a tiny sliver of the solar photosphere is visible through the lunar valleys, creating a bright "diamond" set against the thin circle of the solar corona (the "ring").

• Why Option 3 is correct: This phenomenon is specifically observed along the peripheral regions (edges) of the totality path. At these locations, the moon’s rugged topography allows sunlight to peak through mountains and craters, creating the distinct flash.
• Why others are incomplete: While the effect occurs at the start and end of totality, Options 1 and 2 are too narrow. Option 3 provides the precise spatial context required for the phenomenon to be visible as a distinct "ring" effect.