The cytoskeleton is made of three types of filaments.
The cytoskeleton helps cells maintain their shape and internal organization, and also provides mechanical support that enables cells to carry out essential functions like division and movement.
Microfilaments (a type of cytoskeleton) can depolymerize (disassemble) and reform quickly, thus enabling a cell to change its shape and move.
i.e. it's shape can be altered.
Cytoskeleton assist in movement from the point above.
Cytoskeleton is made of protein filaments.
Therefore the second and fourth points correctly describe the cytoskeleton.