Which observation from Griffith's experiment with Streptococcus pneumoniae provided the strongest evidence for the existence of a 'transforming principle'?
Live non-virulent bacteria did not cause disease in mice.
Heat-killed virulent bacteria did not cause disease in mice.
Live virulent bacteria caused disease in mice.
Heat-killed virulent bacteria, when mixed with live non-virulent bacteria, caused the latter to become virulent.
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