$4\mathrm{.}7$ What is the Loss$-$function in an Extreme Learning Machine?

a$)$ Mean Square Error between the actual samples and the ELM$-$generated samples

b$)$ There is no Loss$-$function; the sample values are taken as the values that need to be attained

c$)$ The cross$-$entropy loss function $($associated with Softmax outputs$)$

d$)$ The binary log loss function.