Three manufacturers of garden tools all sell through one wholesaler to five retailers. The number of contacts needed for all manufacturers to contact all retailers in this channel structure is $\_.$ If the wholesaler is eliminated from the channel, the number of contacts needed would be $\_?$

Group of answer choices

$15$; $8$

$8$; $15$

$15$; $6$

$5$; $5$

$6$; $15$