A 60-year-old with suspected NSTEMI but nondiagnostic ECG and negative first hs-troponin has persistent symptoms. According to the chest pain guideline, which is appropriate?ASerial high-sensitivity troponins and risk-based testing (e.g., CCTA or stress) rather than routine immediate invasive angiographyBImmediate invasive angiography in all low-risk patientsCNo further testing if first troponin negativeDCK-MB levels to decideEDischarge without follow-upCheck my answer