Which of the following is arranged in chronological order?
a. Srigupta – Chandragupta I – Samudragupta – Vikramaditya
b. Chandragupta I – Vikramaditya – Srigupta – Samudragupta
c. Srigupta – Samudragupta – Vikramaditya – Chandragupta I
d. Vikramaditya – Srigupta – Samudragupta – Chandragupta I