【C017113】在MyBatis中，以下选项中写法有误的是（ ）。

• A.<select id="queryUser" resultType="User" parameterType="User">
  
      SELECT * FROM tb_users t
  
      <where>
  
          <if test="searchFlag != null and searchFlag =='name'" >
  
              t.user_name = #{userName}
  
          </if>
  
          <else>
  
              t.login_name = #{userName}
  
          </else>
  
      </where> 
  
  </select>

• B.<select id="queryUser" resultType="User" parameterType="User">
  
      SELECT * FROM tb_users t
  
  <where>
  
      <choose>
  
              <when test="searchFlag != null and searchFlag =='name'" >
  
                  t.user_name = #{userName}
  
              </when>
  
              <otherwise>
  
                  t.login_name = #{userName}
  
              </otherwise>
  
          </choose>
  
      </where> 
  
  </select>

• C.<select id="queryUser" resultType="User" parameterType="User">
  
      SELECT * FROM tb_users t
  
      <where>
  
          <if test="userAge != null and userAge !=''" >
  
              t.user_age < #{userAge}
  
          </if>
  
      </where> 
  
  </select>

• D.<select id="queryUser" resultType="User" parameterType="string">
  
      SELECT * FROM tb_users t
  
      <where>
  
          <if test="userAge != null and userAge !=''" >
  
              t.user_id IN (#{ids})
  
          </if>
  
      </where> 
  
  </select>