**Core Concept**
The diagnostic workup for a septate uterus involves evaluating the uterine cavity and identifying any anomalies. This is crucial before surgery to plan the appropriate intervention. **Imaging techniques** and **hysteroscopy** are key components of this evaluation.

**Why the Correct Answer is Right**
Although the options are missing, typically, the correct answer would involve a combination of imaging studies such as **saline infusion sonohysterography (SIS)**, **magnetic resonance imaging (MRI)**, and **hysteroscopy** to assess the uterine cavity and septum. These methods help in confirming the diagnosis and planning surgical correction.

**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it suggested only one method, as a combination is often necessary for comprehensive evaluation.
**Option B:** Might be incorrect if it proposed an outdated or less accurate method.
**Option C:** Could be wrong if it recommended an invasive procedure without prior non-invasive imaging.
**Option D:** Might be incorrect if it suggested skipping diagnostic workup altogether.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that **hysteroscopic metroplasty** is often the treatment of choice for septate uterus, and accurate pre-surgical diagnosis is vital for planning this procedure. Understanding the role of **imaging** in diagnosing uterine anomalies is key.

**Correct Answer:** D. Saline infusion sonohysterography and hysteroscopy.