Indicate Whether Each of the Following Descriptions Better Matches MiRNAs

Short Answer

Indicate whether each of the following descriptions better matches miRNAs (M) or siRNAs (S) in animal cells. Your answer would be a four-letter string composed of letters M and S only, e.g. MMMM.
( ) They usually cleave their target RNAs using the slicing activity of the Argonautes.
( ) They typically show perfect complementarity with their target RNA.
( ) They can bind to the RITS as well as the RISC complex.
( ) They seem to be the more ancient form of small noncoding RNAs.