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The Durand Line, which is the correct answer here, is the 2,670-kilometer (1,660 mi) international border between Afghanistan and Pakistan. It was established in Kabul on November 12, 1893, between Sir Mortimer Durand of British India and Afghan Amir Abdur Rahman Khan for fixing the limit of their respective spheres of influence.
The MacMahon Line denotes colonial era borders between Tibet (then a part of the Qing Empire) and British India, the line is named after Henry McMahon, foreign secretary of British India. A different geographical area, so not the correct label for this map.
The option of the line of demarcation between India and Pakistan suggested by the Boundary Commission (1947) does not apply here as that line, also known as the Radcliffe Line, specifically refers to the border drawn during the partition of India.
The fourth option, route followed by the Younghusband Expedition, refers to an invasion of Tibet by British Indian forces in 1904, led by Colonel Francis Younghusband, again it`s not a border line or relevant for this map.
Therefore, option 1 "Durand line" is the correct answer.