Indicate Whether Each of the Following Descriptions Matches Actin Filaments

Short Answer

Indicate whether each of the following descriptions matches actin filaments (A), microtubules (M), or intermediate filaments (I). Your answer would be a three-letter string composed of letters A, M, and I only, e.g. MMA.
( ) They have the smallest persistence length.
( ) They lack polarity.
( ) They have the highest tensile strength.