With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct ? 1. OMT is measured up to a depth of 26℃ isotherm which is 129 meters in the south-western Indian Ocean during January - March. 2. OMT collected during January - March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean. Select the correct answer using the code given below :

Explains the vertical temperature structure and names the thermocline as the boundary where temperature falls rapidly from surface to depth.

A student could check whether the 26°C isotherm commonly lies within or near the thermocline (100–400 m) in various regions to judge use of that isotherm as an OMT bottom.

Repeats the thermocline definition and the typical depth range (about 100–400 m) and notes deep-ocean temperatures approach 0°C.

Compare the typical depth of the 26°C isotherm (using sea temperature profiles or maps) with the thermocline depth given here to assess if 26°C is a consistent OMT marker.

Gives an example using a specific temperature threshold (~27°C) and a warm-water layer depth (60–70 m) important for tropical storms, showing thresholds and depth-layers are used in ocean studies.

Use this example of a temperature threshold and associated depth to infer that other specific isotherms (e.g., 26°C) can be used as practical layer boundaries for measurements like OMT, especially in the tropics.

Provides typical surface temperature values (about 27°C at the equator) and notes latitudinal decline, indicating where a 26°C isotherm might be located geographically.

Combine these surface temperatures with a world map to locate regions where a 26°C surface or subsurface isotherm is plausible, helping to test whether measuring down to that isotherm would capture a meaningful warm layer.

Describes rates of temperature decrease with depth (rapid near surface, slower below), giving a basis for understanding how deep a particular isotherm (e.g., 26°C) might occur.

Apply the described vertical temperature gradients to estimate approximate depths of given isotherms in different regions to evaluate the practicality of using the 26°C isotherm as an OMT boundary.