What is the source organism for $\text{EcoRI}$,a restriction endonuclease?

Restriction in Restriction endonuclease enzyme refers to

Restriction endonucleases:

Restriction enzymes that are used in the construction of recombinant $DNA$ are endonucleases which cut the $DNA$ at 'specific-recognition sequence'. What would be the disadvantage if they do not cut the $DNA$ at specific-recognition sequence?

Which antibiotic resistance is naturally found in $E. coli$?

Which of the following statements is not correct regarding the $Eco RI$ restriction endonuclease enzyme?
$I.$ $Eco RI$ restriction endonuclease enzyme is isolated from $Escherichia \; coli \; RY13$.
$II.$ Its recognition sequence is $5^{\prime}-GAATTC-3^{\prime}$ / $3^{\prime}-CTTAAG-5^{\prime}$.
$III.$ Its site of cleavage is between $G$ and $A$ in the sequence $5^{\prime}-GAATTC-3^{\prime}$.