Option 1 states that both the obverse and reverse of Gupta coins had only the king`s portrait and a date. This statement is incorrect because Gupta coins also depicted other images besides the king`s portrait and date.

Option 2 suggests that both sides of Gupta coins featured only an image of a deity and a date. This statement is also incorrect because Gupta coins included various other images and motifs.

Option 3 is the correct answer. It states that generally, the obverse side of Gupta coins displayed the king`s portrait, while the reverse side showcased an image of a deity or a motif. This option accurately reflects the common design of Gupta coins, as they often depicted the king on one side and a religious symbol or motif on the other.

Option 4 claims that the obverse of Gupta coins typically featured the king`s portrait, and the reverse side always had a date. This statement is incorrect because Gupta coins did not always have a date on the reverse side.

In summary, option 3 is the correct statement about the coins of the Gupta rulers, as it accurately describes the typical design of their coins.