What is the correct chronological order of the publication of the following?
(a) German Grammar (Jacob Grimm)
(b) Comparative Grammar of Sanskrit, Zend. Greek Latin. Lithuanian. Gothic and German (Franz Bopp)
(c) An Investigation into the Origin of Old Norse or Icelandic Language (Rasmus Rask)
(d) Concerning the Conjugation System of the Sanskrit Language in Comparison with those of the Greek. Latin. Persian and German Languages (Franz Bopp)
1
(a, (b), (c), (d)
2
(b), (c), (d), (a)
3
(c), (d), (a), (b)
4
(d), (c), (a), (b)