Consider students $=\{\text{'}$Semester$\_1\text{'}$ : $\{\text{'}$Ryan$\text{'}$:$20,$ 'Mercy':$25\},$ 'Semester$\_2\text{'}$ : $\{\text{'}$Justin$\text{'}$:$21,$ 'Andrea':$26\}\}$

$.$ What command should be used to obtain the count of entries?

Question $7$ options:

len$($students$)$

students.size$()$

students.len$()$

size$($students$)$