Let $\backslash$Sigma $=\{0,1,2,3,4,5,6,7,8,9\},$ and N$,$ the set of nonterminals, be $\{$D$,$ E$\},$ with E being the start symbol, and the productions are D $->$ digit, which is shorthand for the $10$ productions D $->0,$ D $->1,$ and so on E $->$ D$,$ E $->$ ED$.$ Which of the following strings could occur in a derivation?

EEE

$\backslash$lambda

EDD

$+45$