Which one of the following pairs is not correctly matched?

The 38th Parallel is not the boundary between Russia and Finland; it is the latitude line that demarcates the border between North Korea and South Korea [t2, t4, t5]. The boundary between Russia and Finland is historically associated with the Mannerheim Line, a defensive fortification used during World War II [t5]. Regarding the other options: the Durand Line was established in 1893 between British India and Afghanistan and currently serves as the international border between Pakistan and Afghanistan [c4, t5, t9]. The Maginot Line was a famous defensive fortification built by France along its border with Germany to prevent invasion [t1, t2, t5]. The Radcliffe Line was the boundary commission's demarcation for the partition of India and Pakistan in 1947 [t5]. Therefore, option 3 is the only incorrectly matched pair.

Sources

1. [1] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 39: After Nehru... > 9. Lord Lansdowne 1888-1894 > p. 820
2. [2] https://education.nationalgeographic.org/resource/durand-line/