b$)$ Elastic strain is defined as the strain that can be recovered during the uploading portion. According to this definition, the elastic strain is $q,(5$ points$)$ Fully recoveres applied loan is

c$)$ Permanent strain is the strain that cannot be recovered. According to this definition. the permanent strain at the end of the experiment is $q,(5$ points$)$

d$)$ What do we call this phenomenon of the change of specimen height during static loading? $($Choose one from the options below$)q,(5$ points$)$

A$.$ Creep

B$.$ Recovery

C$.$ Relaxation

D$.$ Fatigue