If Sample class has a Length property with get and set accessors then which of the following statements will work correctly?

$1.$

Sample. Length $=20$;

$2.$

Sample $m=$ new SampleO;

m$.$ Length $=10$;

$3.$

Console. WriteL ine$($Sample$.$ Length$)$;

$4.$

Sample $m=$ new SampleO;

int len;

len $=m.$ Length;

$5.$

Sample $m=$ new SampleO;

$m*$ Length $=m*$ Length $+20$ ;

a$.1,3$

b$.2,4,5$

c$.4$ only

d$.3,5$