With reference to ‘Isotopes’, which of the following statements is/are correct?

1. Atoms with identical atomic numbers but different atomic mass numbers are known as isotopes.
2. Protium, Deuterium and Tritium are isotopes of carbon.

Select the correct answer from the code given below:
Code:

A) Only 2

B) Neither 1 nor 2

C) Both 1 and 2

D) Only 1

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2025 (GS Paper I)