Correct Answer is : $cmp

Correct Answer is : $gte returns true if the first value is greater than or equal to the second

Correct Answer is : Arithmetic expressions does not support date arithmetic

Correct Answer is : $add

Correct Answer is : $rem

Correct Answer is : 1 and 31

Correct Answer is : $millis returns the milliseconds of a date as a number between 0 and 1000

Correct Answer is : $dayOfYear

Correct Answer is : $year

Correct Answer is : $cond accepts either two expressions in an ordered list or three named parameters

Correct Answer is : $hour

Correct Answer is : $dateToString

Correct Answer is : Null

Correct Answer is : Accumulators

Correct Answer is : $group

Correct Answer is : $avg ignores numeric values

Correct Answer is : $sum

Correct Answer is : $sort

Correct Answer is : $first is not meaningful when documents are in a defined order

Correct Answer is : $last