The structure of an APT attack does not follow a blueprint, but there is a common methodology for the attack. Match the attack steps to their description:

$1$

internal reconnaissance

$2$

initial compromise

$3$

lateral propagation, compromising other systems on track towards the goal

$4$

the end goal of the attacker, for example, may be to exfiltrate sensitive data out

$5$

escalation of privileges

$6$

mission completion