What data collection type is calc$\_$dB after the following code segment is executed:

import math

def $dB(V1,V2)$ :

return $20**$ math. $log10(V\frac{1}{V}2),$ V$1,$ V$2$

calc$\_$dB $=dB(10,5)$

a$.)$ Float

b$.)$ tuple

c$.)$ set

d$.)$ list