A company has hired a red team to simulate the tactics, techniques, and procedures of APT $1337,$ a Malaysian profit$-$focused hacker syndicate, against their network.

As they attempt to gain access to the company's systems, they use APT $337\text{'}$s signature combination of social engineering techniques, data protection bypasses, and technical exploits to bypass security controls.

What activity is the red team conducting?

Penetration testing

Adversary emulation

Output encoding

Security control testing