Determine whether the indicated sequence can be the first three terms of an arithmetic or geometric sequence, and, if so$,$ find common ratio and the next two terms of the sequence.

$($A$)-3,-7,-11$dots

$($C$)11,16,21$dots

$($B$)2,-4,8$dots

$($D$)\frac{1}{7},\frac{1}{14},\frac{1}{28}$dots

$($A$)$ Select the correct choice below and, if necessary, fill in the answer boxes within your choice.

A$.$ The sequence $-3,-7,-11$dots is arithmetic with a common difference of The next two terms are $($Use a comma to separate answers as needed.$)$

B$.$ The sequence $-3,-7,-11$dots is geometric with a common ratio of The next two terms are $($Use a comma to separate answers as needed.$)$

C$.$ The sequence $-3,-7,-11$dots is neither arithmetic nor geometric.

$($B$)$ Select the correct choice below and, if necessary, fill in the answer boxes within your choice.

A$.$ The sequence $2,-4,8$dots is arithmetic with a common difference of The next two terms are $($Use a comma to separate answers as needed.$)$

B$.$ The sequence $2,-4,8$dots is geometric with a common ratio of The next two terms are