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------------------------------------------------ A is limited to the scanning and enumeration phase of the cyber kill chain, while a encompasses the full kill chain.

a) Threat actor; Cyber threat
b) Vulnerability; Cyber threat
c) Malware; Cyber attack
d) Discovery; Cyber attack

The correct answer fills the blanks with 'threat actor' and 'cyber threat', stating that a threat actor is involved in early stages like scanning, whereas a cyber threat refers to the entire range of malicious activities in the cyber kill chain. The correct answer is option a.

Explanation:

A saved threat actor is limited to the scanning and enumeration phase of the cyber kill chain, while a cyber threat encompasses the full kill chain. The best match for the blanks provided would be: a) Threat actor; Cyber threat. Therefore, a threat actor only pertains to the early stages of identifying and exploring vulnerabilities in a system, while a cyber threat can refer to the complete spectrum of malicious activities from the initial reconnaissance to the final objective, such as data exfiltration or system damage.