Rewrite the expression 7c^1/3 * 3c^4/3 in radical form

7∛c*3∛(c⁴)- if you need only to rewrite
if you need to simplify, it can be made 2 ways

1)7∛c*3∛(c⁴) = 7∛c*3c∛(c)=21c∛(c²)
2) 7*3*c(^1/3)c(^4/3)=21c(^5/3)=21c(^1 2/3)=21c∛(c²)

The answer is something i don’t know